Update image raw src

Update image src to site [ http://raw.githubusercontent.com ]

And it is available to make npm page to show the right image.

README.md

@@ -14,7 +14,7 @@ Cordova Local-Notification Plugin
 The essential purpose of local notifications is to enable an application to inform its users that it has something for them — for example, a message or an upcoming appointment — when the application isn’t running in the foreground.<br>
 They are scheduled by an application and delivered on the same device.
 
-<img width="35%" align="right" hspace="19" vspace="12" src="https://github.com/katzer/cordova-plugin-local-notifications/blob/example/images/android.png"></img>
+<img width="35%" align="right" hspace="19" vspace="12" src="https://raw.githubusercontent.com/katzer/cordova-plugin-local-notifications/example/images/android.png"></img>
 
 ### How they appear to the user
 Users see notifications in the following ways: