Update .travis.yml

dear-lizhihua · web-flow · commit 9201103240de · 2017-12-29T08:12:52.000+08:00
diff --git a/.travis.yml b/.travis.yml
@@ -11,3 +11,4 @@ install:
   - npm install --global yarn
   - yarn
   - sudo pip install proselint
+group: deprecated-2017Q4
