Travis Cache

Author: Emmanouil Konstantinidis

Diff for: .travis.yml

@@ -11,6 +11,11 @@ env:
   - DJANGO_VERSION=1.8
   - DJANGO_VERSION=1.9
 
+cache:
+  - pip
+  - directories:
+    - rest_framework_docs/static/node_modules/
+
 before_install:
   - nvm install 5