Enable pip caching on Travis

diff --git a/.travis.yml b/.travis.yml
index 6cca9b4a9b2683d46ef8adeaf2bd6d06ab57f8db..f4868b266ef96117c6f64dad1023c83fcfadd6ab 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,7 @@
 sudo: false
 
 language: python
+cache: pip
 
 python:
 - '2.6'