(fix) removed ':' from case statement

Author: dan-h-ch

egghead.io_video_tutorial_notes.md

@@ -1346,7 +1346,7 @@ const visibilityFilter = (
   action
 ) => {
   switch (action.type) {
-    case: 'SET_VISIBILITY_FILTER':
+    case 'SET_VISIBILITY_FILTER':
       return action.filter;
     default:
       return state;