Revert Homebrew python change

- 00a64c6
- 6bd9aa8
- b1949f8

Author: splhack

.travis.yml

@@ -26,7 +26,7 @@ sudo: false
 
 before_install:
   - brew update || brew update
-  - brew upgrade python
+  - brew install python3
   - brew install lua
   - brew install ruby