Fix type declaration for play operation and match existing implementation (#120)

Author: pduchesne

src/typings/spotify-api.d.ts

@@ -125,6 +125,17 @@ declare namespace SpotifyApi {
         offset?: Object;
     }
 
+    interface PlayParameterObject {
+        device_id?: string;
+        context_uri?: string;
+        uris?: string[];
+        offset?: {
+            position?: number;
+            uri?: string;
+        };
+        position_ms?: number;
+    }
+
     //
     // Responses from the Spotify Web API in the same order as in the API endpoint docs seen here:
     // [API Endpoint Reference](https://developer.spotify.com/web-api/endpoint-reference/)

src/typings/spotify-web-api.d.ts

@@ -940,8 +940,8 @@ declare namespace SpotifyWebApi {
          * one is the error object (null if no error), and the second is the value if the request succeeded.
          * @return {Object} Null if a callback is provided, a `Promise` object otherwise
          */
-        play(options?: SpotifyApi.DeviceSpecificParameterObject): Promise<void>;
-        play(options: SpotifyApi.DeviceSpecificParameterObject, callback: VoidResultsCallback): void;
+        play(options?: SpotifyApi.PlayParameterObject): Promise<void>;
+        play(options: SpotifyApi.PlayParameterObject, callback: VoidResultsCallback): void;
         play(callback: VoidResultsCallback): void;
 
         /**