Setup.sh: fix Python3.6 when broken on macOS

setup.sh

@@ -33,6 +33,8 @@ function install_macos () {
         /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
     fi
     brew install python3 wget ta-lib
+
+    test_and_fix_python_on_mac
 }
 
 # Install bot Debian_ubuntu
@@ -81,6 +83,19 @@ function reset () {
     updateenv
 }
 
+function test_and_fix_python_on_mac() {
+
+    if ! [ -x "$(command -v python3.6)" ]
+    then
+        echo "-------------------------"
+        echo "Fixing Python"
+        echo "-------------------------"
+        echo "Python 3.6 is not linked in your system. Fixing it..."
+        brew link --overwrite python
+        echo
+    fi
+}
+
 function config_generator () {
 
     echo "Starting to generate config.json"