Fix wrong type

src/ios/APPLocalNotification.h

@@ -27,7 +27,7 @@
 @interface APPLocalNotification (Private)
 
 - (NSMutableDictionary*) repeatDict;
-- (NSMutableDictionary*) userDict:(NSMutableDictionary*)options;
+- (NSDictionary*) userDict:(NSMutableDictionary*)options;
 - (UILocalNotification*) prepareNotification:(NSMutableDictionary*)options;
 
 @end

src/ios/APPLocalNotification.m

@@ -71,7 +71,7 @@
 /**
  * @private
  */
-- (NSMutableDictionary*) userDict:(NSMutableDictionary*)options {
+- (NSDictionary*) userDict:(NSMutableDictionary*)options {
 	NSString     *notificationId = [options objectForKey:@"id"];
     NSString     *bg             = [options objectForKey:@"background"];
     NSString     *fg             = [options objectForKey:@"foreground"];