Update README.md

This is the location of the addon folder if you are using Blender 2.79

utils/exporters/blender/README.md

@@ -34,6 +34,10 @@ In your user's library for user installed Blender addons:
 
     /Users/(myuser)/Library/Application Support/Blender/2.7X/scripts/addons
     
+OR (for 2.79)
+    
+    /Applications/Blender/blender.app/Contents/Resources/2.79/scripts/addons
+
 ### Linux
 
 By default, this should look like: