Use bash in CI

dtan4 · dtan4 · commit 462771c0943b · 2016-01-09T00:58:18.000+09:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,7 @@
 sudo: required
 services:
   - docker
+language: bash
 before_install:
   - docker -v
 script:
