Drop --version

This flag causes the command to exit immediately with success

Author: BanzaiMan

.travis.yml

@@ -42,7 +42,7 @@ install:
     brew uninstall pyenv
     brew install pyenv --HEAD
   fi
-  if ! python --version -m pip >&/dev/null; then
+  if ! python -m pip >&/dev/null; then
     wget https://bootstrap.pypa.io/get-pip.py
     python get-pip.py
   fi