Changed Travis to track develop
Merge branch 'release-2.0'
Merge branch 'release-2.1'
Merge branch 'release-v3.0'
Merge branch 'release-v3.1'
Merge branch 'release-v3.2'
Merge branch 'release-v3.3'
Merge branch 'release-v3.4'
Merge branch 'release-v3.5'
Merge branch 'release-v3.6'
Merge branch 'release-v3.6.1'
Merge branch 'release-v3.6.2'
Merge branch 'release-v3.6.3'
Merge branch 'release-v3.6.4'
Merge branch 'release-v3.7'
Merge branch 'release-v3.8'
Merge branch 'release-v4.0'
Merge branch 'release-v4.1'
Merge branch 'release-v4.2'
Merge branch 'release-v4.3'