[flutter_appauth] fix iOS warnings (MaikuB#124)

* fix warnings displayed picked up in XCode

* bump plugin for release

Author: MaikuB

flutter_appauth/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.9.1+1
+
+* Fixes warnings picked up in Xcode raised in issue [123](https://github.com/MaikuB/flutter_appauth/issues/123)
+
 ## 0.9.1
 
 * [iOS] Update AppAuth SDK dependency to 1.3.1

flutter_appauth/ios/Classes/FlutterAppauthPlugin.m

@@ -197,7 +197,7 @@ - (void)performAuthorization:(OIDServiceConfiguration *)serviceConfiguration cli
     }
 }
 
-- (NSObject<OIDExternalUserAgent> *)userAgentWithViewController:(UIViewController *)rootViewController useEphemeralSession:(BOOL)useEphemeralSession {
+- (id<OIDExternalUserAgent>)userAgentWithViewController:(UIViewController *)rootViewController useEphemeralSession:(BOOL)useEphemeralSession {
     if (useEphemeralSession) {
         return [[OIDExternalUserAgentIOSNoSSO alloc]
                 initWithPresentingViewController:rootViewController];

flutter_appauth/ios/Classes/OIDExternalUserAgentIOSNoSSO.h

@@ -17,9 +17,9 @@
  */
 
 #import <UIKit/UIKit.h>
+#import "OIDExternalUserAgent.h"
 
 @class SFSafariViewController;
-@protocol OIDExternalUserAgent;
 
 NS_ASSUME_NONNULL_BEGIN
 

flutter_appauth/pubspec.yaml

@@ -1,6 +1,6 @@
 name: flutter_appauth
 description: This plugin provides an abstraction around the Android and iOS AppAuth SDKs so it can be used to communicate with OAuth 2.0 and OpenID Connect providers
-version: 0.9.1
+version: 0.9.1+1
 homepage: https://github.com/MaikuB/flutter_appauth/tree/master/flutter_appauth
 
 environment: