github/hubot

Merge pull request #1185 from github/release-2.19.0
Prepare for 2.19.0

Merge pull request #1121 from github/release-2.18.0
Release 2.18.0

Merge pull request #1083 from github/relase-2.17.0
Release 2.17.0

Merge pull request #1035 from github/release-2.16.0
Release 2.16.0

Merge pull request #1030 from github/release-v2.15.0
Prepare for v2.15.0 release

Merge pull request #1016 from github/release-v2.14.0
Prepare for v2.14.0 release

Merge pull request #981 from github/release-v2.13.2
Prepare for v2.13.2 release

Merge pull request #969 from github/release-2.13.1
Prepare for 2.13.1 release

Merge pull request #964 from github/release-v2.13.0
Release v2.13.0

Merge pull request #915 from github/release-2.12.0
Prepare for v2.12.0