title: using AudioPlayer in flutter gives this error
body: <p>Error: MissingPluginException(No implementation found for method play on channel danielr2001/audioplayer)
  at Object.throw_ [as throw] (http://localhost:59189/dart_sdk.js:5037:11)
  at MethodChannel._invokeMethod (http://localhost:59189/packages/flutter/src/services/system_channels.dart.lib.js:943:21)
  at _invokeMethod.next ()
  at http://localhost:59189/dart_sdk.js:37374:33
  at _RootZone.runUnary (http://localhost:59189/dart_sdk.js:37245:59)
  at _FutureListener.thenAwait.handleValue (http://localhost:59189/dart_sdk.js:32501:29)
  at handleValueCallback (http://localhost:59189/dart_sdk.js:33028:49)
  at Function._propagateToListeners (http://localhost:59189/dart_sdk.js:33066:17)
  at _Future.new.[_completeWithValue] (http://localhost:59189/dart_sdk.js:32914:23)
  at async._AsyncCallbackEntry.new.callback (http://localhost:59189/dart_sdk.js:32935:35)
  at Object._microtaskLoop (http://localhost:59189/dart_sdk.js:37497:13)
  at _startMicrotaskLoop (http://localhost:59189/dart_sdk.js:37503:13)
  at http://localhost:59189/dart_sdk.js:33274:9</p>