Update README.md

Author: Raycosine

glue/crumble/README.md

@@ -17,7 +17,7 @@ Crumble is not polished.**
 - [Using Crumble](#using-crumble)
   - [Loading and Saving Circuits](#loading-and-saving-circuits)
   - [Keyboard Controls](#keyboard-controls)
-    - [Mouse Controls](#mouse-controls)
+  - [Mouse Controls](#mouse-controls)
 - [Building Crumble](#building-crumble)
 - [Testing Crumble](#testing-crumble)