feat: export player error names

Author: Michał Kardyś

index.js

@@ -1,6 +1,9 @@
 import YoutubeIframe from './src/YoutubeIframe';
 import {getYoutubeMeta} from './src/oEmbed';
-import {PLAYER_STATES_NAMES as PLAYER_STATES} from './src/constants';
+import {
+  PLAYER_STATES_NAMES as PLAYER_STATES,
+  PLAYER_ERROR_NAMES as PLAYER_ERRORS,
+} from './src/constants';
 
 export default YoutubeIframe;
-export {getYoutubeMeta, PLAYER_STATES};
+export {getYoutubeMeta, PLAYER_STATES, PLAYER_ERRORS};