Merge pull request #325 from prometheus/sinjo-prepare-4-2-5

Prepare release 4.2.5

Merge pull request #320 from prometheus/sinjo-prepare-4-2-4

Prepare release 4.2.4

Merge pull request #313 from prometheus/sinjo-prepare-4-2-3

Prepare release 4.2.3

Merge pull request #298 from prometheus/sinjo-prepare-4-2-2

Prepare release 4.2.2

Merge pull request #292 from prometheus/sinjo-prepare-4-2-1

Prepare release 4.2.1

Merge pull request #288 from prometheus/sinjo-prepare-release-4-2-0

Prepare release 4.2.0

Merge pull request #282 from prometheus/sinjo-fix-date

Fix release date in CHANGELOG.md

Merge pull request #252 from prometheus/sinjo-prepare-4-0

Prepare release 4.0.0

Merge pull request #246 from prometheus/sinjo-update-readme-date

Fill in placeholder date in CHANGELOG.md

Merge pull request #196 from prometheus/v2_1

Release v2.1