scripts: Update Python versions for macpython following 3.8.0 release

Author: thewtex

scripts/macpython-install-python.sh

@@ -203,10 +203,11 @@ sudo rm -rf ${MACPYTHON_FRAMEWORK}
 LATEST_27=2.7.14
 LATEST_34=3.4.7
 LATEST_35=3.5.4
-LATEST_36=3.6.6
-LATEST_37=3.7.0
+LATEST_36=3.6.9
+LATEST_37=3.7.5
+LATEST_38=3.8.0
 
-for pyversion in $LATEST_27 $LATEST_35 $LATEST_36 $LATEST_37; do
+for pyversion in $LATEST_35 $LATEST_36 $LATEST_37 $LATEST_38; do
   install_macpython $pyversion
   install_pip
   install_virtualenv