Use the local sbt script since TravisCI crashes with the pre-installed sbt

xerial · xerial · commit 606cf982dd2a · 2015-12-22T10:16:31.000+09:00
diff --git a/.travis.yml b/.travis.yml
@@ -10,5 +10,5 @@ branches:
     - /^v07.*$/
 
 script:
-  - sbt test
-  - sbt test -J-Dmsgpack.universal-buffer=true
+  - ./sbt test
+  - ./sbt test -J-Dmsgpack.universal-buffer=true
