Travis fix for macOs build.

Author: Kostya K

travis-scripts/pre_install.macos.sh

@@ -3,10 +3,18 @@
 brew update
 
 #Use this specific python 3.5.3 version because of 'pyinstaller' compatibility issues
-brew install https://raw.githubusercontent.com/Homebrew/homebrew-core/ec545d45d4512ace3570782283df4ecda6bb0044/Formula/python3.rb
+#brew install https://raw.githubusercontent.com/Homebrew/homebrew-core/ec545d45d4512ace3570782283df4ecda6bb0044/Formula/python3.rb
+
+#brew install python3
+brew upgrade python
 
 #virtualenv env -p python3
 #source env/bin/activate
+echo Which python:
+which python3
+
+#echo Which python3:
+#which python3
 
 echo Current active python version:
 python3 --version
@@ -18,4 +26,4 @@ pip3 --version
 pip3 install pyinstaller
 
 echo Installed pyinstaller version:
-pyinstaller --version
+pyinstaller --version