Add notification when merging changes into the tree

app/src/actions/Global.ts

@@ -1,11 +1,15 @@
-import { ActionTypes, AppState, CustomAction } from '../reducers'
-import { Dispatch } from 'redux'
+import { ActionTypes } from '../reducers'
 
 export const showError = (error?: string) => ({
   error,
   type: ActionTypes.showError,
 })
 
+export const showNotification = (notification?: string) => ({
+  notification,
+  type: ActionTypes.showNotification,
+})
+
 export const didLaunch = () => ({
   type: ActionTypes.didLaunch,
 })