add crystal format check to travis config

greenbigfrog · will · commit 16531b9da289 · 2018-01-17T15:14:35.000-08:00
diff --git a/.travis.yml b/.travis.yml
@@ -27,3 +27,6 @@ before_install:
 
 notifications:
   email: false
+
+script:
+  - crystal tool format --check
