Merge pull request #4 from Kuchitama/master

messageの取得を実装
Bump sbt version to 0.13.7 (and other deps upgrade)
Merge pull request #6 from seratch/sbt-0.13.7

Bump sbt version to 0.13.7 (and other deps upgrade)
add travis.yml
add travis badge in REDME
kick ci
sbt-pgp move `~/.sbt/0.13/plugins/gpg.sbt`