Bump to version 3.1.1 (#231)

Author: Calinou

demo/addons/godot-git-plugin/plugin.cfg

@@ -3,5 +3,5 @@
 name="Godot Git Plugin"
 description="This plugin lets you interact with Git without leaving the Godot editor. More information can be found at https://github.com/godotengine/godot-git-plugin/wiki"
 author="twaritwaikar"
-version="v3.0.1"
+version="3.1.1"
 script="godot-git-plugin.gd"