Update youtube-dl to 2018.6.19

[pyup-bot]

This PR updates youtube-dl from 2018.6.18 to 2018.6.19.

Changelog

2018.06.19

Core
+ [extractor/common] Introduce expected_status in _download_* methods
for convenient accept of HTTP requests failed with non 2xx status codes
+ [compat] Introduce compat_integer_types

Extractors
* [peertube] Improve generic support (16733)
+ [6play] Use geo verification headers
* [rtbf] Fix extraction for python 3.2
* [vgtv] Improve HLS formats extraction
+ [vgtv] Add support for www.aftonbladet.se/tv URLs
* [bbccouk] Use expected_status
* [markiza] Expect 500 HTTP status code
* [tvnow] Try all clear manifest URLs (15361)

Links

• PyPI: https://pypi.org/project/youtube-dl
• Changelog: https://pyup.io/changelogs/youtube-dl/
• Repo: https://github.com/rg3/youtube-dl

Resolves #201