Add SpotifyUri#equals(any: Any?)

Author: molikuner

src/main/kotlin/com/adamratzman/spotify/utils/SpotifyUris.kt

@@ -37,6 +37,11 @@ sealed class SpotifyUri(input: String, type: String) {
             this.id = it.remove(type)
         }
     }
+    
+    override fun equals(other: Any?): Boolean {
+        val spotifyUri = other as? SpotifyUri ?: return false
+        return spotifyUri.uri == this.uri
+    }
 }
 
 /**
@@ -77,4 +82,4 @@ class UserURI(input: String) : SpotifyUri(input, "user")
  * @property uri retrieve this URI as a string
  * @property id representation of this uri as an id
  */
-class PlaylistURI(input: String) : SpotifyUri(input, "playlist")
+class PlaylistURI(input: String) : SpotifyUri(input, "playlist")