Fix README

Author: Mygod

README.md

@@ -20,7 +20,7 @@
 * Set environment variable `ANDROID_HOME` to `/path/to/android-sdk`
 * Set environment variable `ANDROID_NDK_HOME` to `/path/to/android-ndk`
 * Create your key following the instructions at https://developer.android.com/studio/publish/app-signing.html
-* Create `mobile/local.properties` from `mobile/local.properties.example` with your own key information
+* Create `local.properties` from `local.properties.example` with your own key information
 * Invoke the building like this
 
 ```bash