Update README.md

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

utils/exporters/blender/README.md

@@ -33,6 +33,10 @@ OR (for 2.6)
 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
 
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