add Openwhyd to list of music APIs (#833)

README.md

@@ -521,6 +521,7 @@ API | Description | Auth | HTTPS | CORS |
 | [MusicBrainz](https://musicbrainz.org/doc/Development/XML_Web_Service/Version_2) | Music | No | Yes | Unknown |
 | [Musikki](https://music-api.musikki.com/reference) | Music | `apiKey` | Yes | Unknown |
 | [Musixmatch](https://developer.musixmatch.com/) | Music | `apiKey` | Yes | Unknown |
+| [Openwhyd](https://openwhyd.github.io/openwhyd/API) | Download curated playlists of streaming tracks (YouTube, SoundCloud, etc...) | `No` | Yes | No |
 | [Songkick](https://www.songkick.com/developer/) | Music Events | `OAuth` | Yes | Unknown |
 | [Songsterr](https://www.songsterr.com/a/wa/api/) | Provides guitar, bass and drums tabs and chords | No | Yes | Unknown |
 | [SoundCloud](https://developers.soundcloud.com/) | Allow users to upload and share sounds | `OAuth` | Yes | Unknown |