Enable pip caching in travis. Try to get the build times down.

rouilj · rouilj · commit cb9fc12939c2 · 2019-10-19T18:37:32.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,7 @@
 language: python
 
+cache: pip
+
 python:
   - 2.7
   - 3.4

-Original file line number
+Diff line change
@@ @@ -1,5 +1,7 @@ @@
 language: python
 +cache: pip
++
 python:
   - 2.7
   - 3.4