Merge pull request #264 from Yoast/feature/2.x/changelog-v2.0.5

Changelog for the 2.0.5 release

Merge pull request #263 from Yoast/feature/1.x/changelog-v1.1.5

Changelog for the 1.1.5 release

Merge pull request #254 from Yoast/feature/4.x/changelog-v4.0.0

Changelog for the 4.0.0 release and other documentation updates

Merge pull request #253 from Yoast/feature/3.x/changelog-v3.1.2

Changelog for the 3.1.2 release

Merge pull request #252 from Yoast/feature/2.x/changelog-v2.0.4

Changelog for the 2.0.4 release

Merge pull request #250 from Yoast/feature/1.x/changelog-v1.1.4

Changelog for the 1.1.4 release

Merge pull request #236 from Yoast/feature/changelog-3.1.1

Changelog for the 3.1.1 release

Merge pull request #232 from Yoast/feature/changelog-3.1.0

Changelog for the 3.1.0 release

Merge pull request #230 from Yoast/feature/changelog-2.0.3

Changelog for the 2.0.3 release

Merge pull request #229 from Yoast/feature/changelog-1.1.3

Changelog for the 1.1.3 release