(Example iOS): Add support for audio messages

Author: vickz84259

example/push_notifications/ios/Runner/Info.plist

@@ -28,6 +28,7 @@
 	<true/>
 	<key>UIBackgroundModes</key>
 	<array>
+		<string>audio</string>
 		<string>remote-notification</string>
 	</array>
 	<key>UILaunchStoryboardName</key>
@@ -51,5 +52,7 @@
 	<false/>
 	<key>flutter_apns.disable_swizzling</key>
 	<true/>
+    <key>NSMicrophoneUsageDescription</key>
+    <string>Your message to user when the microphone is accessed for the first time</string>
 </dict>
 </plist>