doc: Add CHANGELOG.md with past release notes

Author: Krinkle

CHANGELOG.md

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+# Changelog
+
+## v2.0.0
+
+Changed:
+
+* Update from QUnit 2.1 to QUnit 2.11. See [upstream release notes](https://github.com/qunitjs/qunit/blob/2.11.2/History.md). [#138](https://github.com/qunitjs/node-qunit/issues/138)
+
+Removed:
+
+* **(SEMVER-MAJOR)** Drop support for EOL Node.js 8 and earlier. See [more information](https://github.com/nodejs/Release). Node 10 or higher is now required.
+
+## v1.0.0
+
+This release upgrades QUnit to 2.x. See also <https://qunitjs.com/upgrade-guide-2.x/>.
+
+Changed:
+
+* **(SEMVER-MAJOR)** Update qunitjs version from 1.23.1 to 2.1.1. (Timo Tijhof)
+* Update istanbul from 0.2-harmony to 0.4.5. [#127](https://github.com/qunitjs/node-qunit/issues/127)
+* doc: Update description and add npm version badge to readme.
+
+Removed:
+
+* **(SEMVER-MAJOR)** Drop support for legacy Node.js ([more information](https://github.com/nodejs/LTS/tree/a5b8bc19b5#readme)). Node 4 or higher is now required.
+
+## v0.9.3
+
+**Note:** The next release will drop support for QUnit 1.x. The new API already works in QUnit 1.23. Use node-qunit 0.9.3 to migrate first, for a seamless upgrade to QUnit 2 after this. See <https://qunitjs.com/upgrade-guide-2.x/> for more information.
+
+Changed:
+
+* Update qunitjs version from 1.10.0 to 1.23.1. (Yomi Osamiluyi)
+* tests: Use shorter timeouts to speed up the async test fixtures.
+
+## v0.9.2
+
+Fixes:
+
+* Add support for Node 6 and Node 7. (Timo Tijhof) [#133](https://github.com/qunitjs/node-qunit/issues/133)
+
+## v0.9.0
+
+Removed:
+
+* Removed buggy regexp option from instrument filter. (Bruno Jouhier) [#126](https://github.com/qunitjs/node-qunit/pull/126)
+
+## v0.8.0
+
+Added:
+* Support instrumentation of multiple files through a new `coverage.files` option. (Bruno Jouhier) [#125](https://github.com/qunitjs/node-qunit/pull/125)