Fix RN 0.48+ warning about requiresMainQueueSetup

ios/ReactNativeLanguages.m

@@ -5,7 +5,10 @@
 
 RCT_EXPORT_MODULE();
 
-#pragma mark - Private API
++ (BOOL)requiresMainQueueSetup
+{
+  return YES;
+}
 
 - (NSMutableArray *)ensureLanguageTags:(NSArray *)languages
 {
@@ -18,8 +21,6 @@ RCT_EXPORT_MODULE();
   return sanitizedLanguages;
 }
 
-#pragma mark - Public API
-
 - (NSDictionary *)constantsToExport
 {
   NSArray *preferredLanguages = [[[UIDevice currentDevice] systemVersion] floatValue] >= 9