Revert "Stop cacheing directories. Order-related?"

This reverts commit 95d44e7.

Author: theengineear

circle.yml

@@ -22,9 +22,9 @@ dependencies:
     # we need to cd out of the project root to ensure the install worked
     - cd ~ && python -c "import plotly"
 
-#  cache_directories:
-#
-#    - "~/.pyenv/versions"  # attempt to just cache installed pyenv things
+  cache_directories:
+
+    - "~/.pyenv/versions"  # attempt to just cache installed pyenv things
 
 test: