Fix pyenv version

ci/travis/before_install.sh

@@ -4,13 +4,12 @@ brew install libsodium
 ## Ensure your brew QT version is up to date. (brew install qt -> qt 4.8)
 brew install qt5
 brew link --force qt5
-brew install pyenv
 brew install pyenv-virtualenv
 
 eval "$(pyenv init -)"
 eval "$(pyenv virtualenv-init -)"
 
-env PYTHON_CONFIGURE_OPTS="--enable-framework" pyenv install $TRAVIS_PYTHON_VERSION
+env PYTHON_CONFIGURE_OPTS="--enable-framework" pyenv install 3.5.0
 
 pyenv shell 3.5.0
 pyenv virtualenv sakia-env