Add pip for TravisCI cache

reyoung · reyoung · commit af02d7cda84c · 2017-01-09T16:02:04.000+08:00
diff --git a/.travis.yml b/.travis.yml
@@ -3,7 +3,7 @@ cache:
   directories:
     - $HOME/third_party
     - $HOME/.ccache
-
+    - $HOME/.cache/pip
 sudo: required
 dist: trusty
 os:
