Update dependency node-fetch to v2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
node-fetch	devDependencies	major	^1.3.3 -> ^2.0.0	source

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Release Notes

bitinn/node-fetch

v2.3.0

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• New: AbortSignal support, with README example.
• Enhance: handle invalid Location header during redirect by rejecting them explicitly with FetchError.
• Fix: update browser.js to support react-native environment, where self isn't available globally.

v2.2.1

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• Fix: compress flag shouldn't overwrite existing Accept-Encoding header.
• Fix: multiple import rules, where PassThrough etc. doesn't have a named export when using node <10 and --exerimental-modules flag.
• Other: Better README.

v2.2.0

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• Enhance: Support all ArrayBuffer view types
• Enhance: Support Web Workers
• Enhance: Support Node.js' --experimental-modules mode; deprecate .es.js file
• Fix: Add __esModule property to the exports object
• Other: Better example in README for writing response to a file
• Other: More tests for Agent

v2.1.2

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• Fix: allow Body methods to work on ArrayBuffer-backed Body objects
• Fix: reject promise returned by Body methods when the accumulated Buffer exceeds the maximum size
• Fix: support custom Host headers with any casing
• Fix: support importing fetch() from TypeScript in browser.js
• Fix: handle the redirect response body properly

v2.1.1

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Fix packaging errors in v2.1.0.

v2.1.0

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• Enhance: allow using ArrayBuffer as the body of a fetch() or Request
• Fix: store HTTP headers of a Headers object internally with the given case, for compatibility with older servers that incorrectly treated header names in a case-sensitive manner
• Fix: silently ignore invalid HTTP headers
• Fix: handle HTTP redirect responses without a Location header just like non-redirect responses
• Fix: include bodies when following a redirection when appropriate

v2.0.0

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This is a major release. Check our upgrade guide for an overview on some key differences between v1 and v2.

General changes

• Major: Node.js 0.10.x and 0.12.x support is dropped
• Major: require('node-fetch/lib/response') etc. is now unsupported; use require('node-fetch').Response or ES6 module imports
• Enhance: start testing on Node.js v4.x, v6.x, v8.x LTS, as well as v9.x stable
• Enhance: use Rollup to produce a distributed bundle (less memory overhead and faster startup)
• Enhance: make Object.prototype.toString() on Headers, Requests, and Responses return correct class strings
• Other: rewrite in ES2015 using Babel
• Other: use Codecov for code coverage tracking
• Other: update package.json script for npm 5
• Other: encoding module is now optional (alpha.7)
• Other: expose browser.js through package.json, avoid bundling mishaps (alpha.9)
• Other: allow TypeScript to import node-fetch by exposing default (alpha.9)

HTTP requests

• Major: overwrite user's Content-Length if we can be sure our information is correct (per spec)
• Fix: errors in a response are caught before the body is accessed
• Fix: support WHATWG URL objects, created by whatwg-url package or require('url').URL in Node.js 7+

Response and Request classes

• Major: response.text() no longer attempts to detect encoding, instead always opting for UTF-8 (per spec); use response.textConverted() for the v1 behavior
• Major: make response.json() throw error instead of returning an empty object on 204 no-content respose (per spec; reverts behavior changed in v1.6.2)
• Major: internal methods are no longer exposed
• Major: throw error when a GET or HEAD Request is constructed with a non-null body (per spec)
• Enhance: add response.arrayBuffer() (also applies to Requests)
• Enhance: add experimental response.blob() (also applies to Requests)
• Enhance: URLSearchParams is now accepted as a body
• Enhance: wrap response.json() json parsing error as FetchError
• Fix: fix Request and Response with null body

Headers class

• Major: remove headers.getAll(); make get() return all headers delimited by commas (per spec)
• Enhance: make Headers iterable
• Enhance: make Headers constructor accept an array of tuples
• Enhance: make sure header names and values are valid in HTTP
• Fix: coerce Headers prototype function parameters to strings, where applicable

Documentation

• Enhance: more comprehensive API docs
• Enhance: add a list of default headers in README

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