Merge pull request #289 from pyca/alex-patch-2

Enabling caching of pip downloads and wheels
diff --git a/.travis.yml b/.travis.yml
index 2216e18..0e5be38 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -96,7 +96,7 @@
       pip install virtualenv
     fi
     python -m virtualenv ~/.venv
-    ~/.venv/bin/pip install tox codecov
+    ~/.venv/bin/pip install tox coverage
 
 script:
   - |
@@ -110,7 +110,7 @@
     ~/.venv/bin/tox
 
 after_script:
-  - ~/.venv/bin/codecov
+  - source ~/.venv/bin/activate && bash <(curl -s https://codecov.io/bash) -e TRAVIS_OS_NAME,TOXENV,OPENSSL
 
 notifications:
   email: false