Fixed issue where Unity 5.6.X would add READ_PHONE_STATE

* This was due to a missing minSdkVersion entry in AndroidManifest.xml.
  - Unity was adding this legacy permission due to defaulting to a lower version.

Author: jkasten2

Unity5OneSignalExample/Assets/Plugins/Android/OneSignalConfig/AndroidManifestTemplate.xml

@@ -1,4 +1,4 @@
-<!-- 
+<!--
    WARNING: Do NOT Modify! Changes will be overwritten by the OneSignal plugin.
             Make your changes to Assets/Plugins/Android/AndroidManifest.xml instead.
 -->
@@ -8,6 +8,8 @@
     android:versionCode="1"
     android:versionName="1.0" >
 
+    <uses-sdk android:minSdkVersion="9" />
+    
     <permission android:name="${manifestApplicationId}.permission.C2D_MESSAGE" android:protectionLevel="signature" />
     <uses-permission android:name="${manifestApplicationId}.permission.C2D_MESSAGE" />
     <application>