update Travis config
Merge pull request #20 from keradus/travis-update

update Travis config
Merge pull request #22 from sjparkinson/develop

Release 1.1.5
Merge pull request #24 from sjparkinson/develop

Release 1.2.0.
Merge branch 'develop'
Merge pull request #26 from sjparkinson/develop

Release 3.0.0
Bump version to 3.0.0.