Merge pull request pytest-dev#250 from BeyondEvil/release-v2.0.1

Release v2.0.1

Merge pull request pytest-dev#251 from BeyondEvil/release-v1.22.1

Release v1.22.1

Release v2.0.0 - Drop Python 2.7 support

Release v1.22.0 (pytest-dev#226)

New release v1.21.1 (pytest-dev#211)

v.1.21.0 (pytest-dev#209)

Fix version number and release date in notes

Update release notes for v1.19.0

Update release notes for v1.18.0

Update release notes for v1.17.0