Revert "update travis"

This reverts commit d6957f0.

Author: chenxsan

.travis.yml

@@ -38,9 +38,7 @@ jobs:
         directories:
           - $HOME/.cache
       install: pip install -r requirements.txt
-      script: 
-        - cp .proselintrc ~/
-        - proselint src/content
+      script: cp .proselintrc ~/ && proselint src/content
 
     - stage: Test
       name: Cypress