Update requests to 2.20.0

[pyup-bot]

This PR updates requests from 2.13.0 to 2.20.0.

Changelog

2.20.0

-------------------

**Bugfixes**

-   Content-Type header parsing is now case-insensitive (e.g.
 charset=utf8 v Charset=utf8).
-   Fixed exception leak where certain redirect urls would raise
 uncaught urllib3 exceptions.
-   Requests removes Authorization header from requests redirected
 from https to http on the same hostname. (CVE-2018-18074)
-   `should_bypass_proxies` now handles URIs without hostnames (e.g.
 files).

**Dependencies**

- Requests now supports urllib3 v1.24.

**Deprecations**

- Requests has officially stopped support for Python 2.6.

2.19.1

-------------------

**Bugfixes**

-   Fixed issue where status\_codes.py's `init` function failed trying
 to append to a `__doc__` value of `None`.

2.19.0

-------------------

**Improvements**

-   Warn user about possible slowdown when using cryptography version
 < 1.3.4
-   Check for invalid host in proxy URL, before forwarding request to
 adapter.
-   Fragments are now properly maintained across redirects. (RFC7231
 7.1.2)
-   Removed use of cgi module to expedite library load time.
-   Added support for SHA-256 and SHA-512 digest auth algorithms.
-   Minor performance improvement to `Request.content`.
-   Migrate to using collections.abc for 3.7 compatibility.

**Bugfixes**

-   Parsing empty `Link` headers with `parse_header_links()` no longer
 return one bogus entry.
-   Fixed issue where loading the default certificate bundle from a zip
 archive would raise an `IOError`.
-   Fixed issue with unexpected `ImportError` on windows system which do
 not support `winreg` module.
-   DNS resolution in proxy bypass no longer includes the username and
 password in the request. This also fixes the issue of DNS queries
 failing on macOS.
-   Properly normalize adapter prefixes for url comparison.
-   Passing `None` as a file pointer to the `files` param no longer
 raises an exception.
-   Calling `copy` on a `RequestsCookieJar` will now preserve the cookie
 policy correctly.

**Dependencies**

-   We now support idna v2.7.
-   We now support urllib3 v1.23.

2.18.4

-------------------

**Improvements**

-   Error messages for invalid headers now include the header name for
 easier debugging

**Dependencies**

-   We now support idna v2.6.

2.18.3

-------------------

**Improvements**

-   Running `$ python -m requests.help` now includes the installed
 version of idna.

**Bugfixes**

-   Fixed issue where Requests would raise `ConnectionError` instead of
 `SSLError` when encountering SSL problems when using urllib3 v1.22.

2.18.2

-------------------

**Bugfixes**

-   `requests.help` no longer fails on Python 2.6 due to the absence of
 `ssl.OPENSSL_VERSION_NUMBER`.

**Dependencies**

-   We now support urllib3 v1.22.

2.18.1

-------------------

**Bugfixes**

-   Fix an error in the packaging whereby the `*.whl` contained
 incorrect data that regressed the fix in v2.17.3.

2.18.0

-------------------

**Improvements**

-   `Response` is now a context manager, so can be used directly in a
 `with` statement without first having to be wrapped by
 `contextlib.closing()`.

**Bugfixes**

-   Resolve installation failure if multiprocessing is not available
-   Resolve tests crash if multiprocessing is not able to determine the
 number of CPU cores
-   Resolve error swallowing in utils set\_environ generator

2.17.3

-------------------

**Improvements**

-   Improved `packages` namespace identity support, for monkeypatching
 libraries.

2.17.2

-------------------

**Improvements**

-   Improved `packages` namespace identity support, for monkeypatching
 libraries.

2.17.1

-------------------

**Improvements**

-   Improved `packages` namespace identity support, for monkeypatching
 libraries.

2.17.0

-------------------

**Improvements**

-   Removal of the 301 redirect cache. This improves thread-safety.

2.16.5

-------------------

-   Improvements to `$ python -m requests.help`.

2.16.4

-------------------

-   Introduction of the `$ python -m requests.help` command, for
 debugging with maintainers!

2.16.3

-------------------

-   Further restored the `requests.packages` namespace for compatibility
 reasons.

2.16.2

-------------------

-   Further restored the `requests.packages` namespace for compatibility
 reasons.

No code modification (noted below) should be necessary any longer.

2.16.1

-------------------

-   Restored the `requests.packages` namespace for compatibility
 reasons.
-   Bugfix for `urllib3` version parsing.

**Note**: code that was written to import against the
`requests.packages` namespace previously will have to import code that
rests at this module-level now.

For example:

 from requests.packages.urllib3.poolmanager import PoolManager

Will need to be re-written to be:

 from requests.packages import urllib3
 urllib3.poolmanager.PoolManager

Or, even better:

 from urllib3.poolmanager import PoolManager

2.16.0

-------------------

-   Unvendor ALL the things!

2.15.1

-------------------

-   Everyone makes mistakes.

2.15.0

-------------------

**Improvements**

-   Introduction of the `Response.next` property, for getting the next
 `PreparedResponse` from a redirect chain (when
 `allow_redirects=False`).
-   Internal refactoring of `__version__` module.

**Bugfixes**

-   Restored once-optional parameter for
 `requests.utils.get_environ_proxies()`.

2.14.2

-------------------

**Bugfixes**

-   Changed a less-than to an equal-to and an or in the dependency
 markers to widen compatibility with older setuptools releases.

2.14.1

-------------------

**Bugfixes**

-   Changed the dependency markers to widen compatibility with older pip
 releases.

2.14.0

-------------------

**Improvements**

-   It is now possible to pass `no_proxy` as a key to the `proxies`
 dictionary to provide handling similar to the `NO_PROXY` environment
 variable.
-   When users provide invalid paths to certificate bundle files or
 directories Requests now raises `IOError`, rather than failing at
 the time of the HTTPS request with a fairly inscrutable certificate
 validation error.
-   The behavior of `SessionRedirectMixin` was slightly altered.
 `resolve_redirects` will now detect a redirect by calling
 `get_redirect_target(response)` instead of directly querying
 `Response.is_redirect` and `Response.headers['location']`. Advanced
 users will be able to process malformed redirects more easily.
-   Changed the internal calculation of elapsed request time to have
 higher resolution on Windows.
-   Added `win_inet_pton` as conditional dependency for the `[socks]`
 extra on Windows with Python 2.7.
-   Changed the proxy bypass implementation on Windows: the proxy bypass
 check doesn't use forward and reverse DNS requests anymore
-   URLs with schemes that begin with `http` but are not `http` or
 `https` no longer have their host parts forced to lowercase.

**Bugfixes**

-   Much improved handling of non-ASCII `Location` header values in
 redirects. Fewer `UnicodeDecodeErrors` are encountered on Python 2,
 and Python 3 now correctly understands that Latin-1 is unlikely to
 be the correct encoding.
-   If an attempt to `seek` file to find out its length fails, we now
 appropriately handle that by aborting our content-length
 calculations.
-   Restricted `HTTPDigestAuth` to only respond to auth challenges made
 on 4XX responses, rather than to all auth challenges.
-   Fixed some code that was firing `DeprecationWarning` on Python 3.6.
-   The dismayed person emoticon (`/o\\`) no longer has a big head. I'm
 sure this is what you were all worrying about most.

**Miscellaneous**

-   Updated bundled urllib3 to v1.21.1.
-   Updated bundled chardet to v3.0.2.
-   Updated bundled idna to v2.5.
-   Updated bundled certifi to 2017.4.17.

Links

• PyPI: https://pypi.org/project/requests
• Changelog: https://pyup.io/changelogs/requests/
• Homepage: http://python-requests.org

[scrutinizer-notifier]

The inspection completed: ****

[pyup-bot]

Closing this in favor of #205