add searchProviders parameter to searchDiscover method (#1437)

* add searchProviders parameter to searchDiscover method

* fix trailing whitespace

* rename parameter

plexapi/myplex.py

@@ -1049,14 +1049,17 @@ def markUnplayed(self, item):
         self.query(key, params=params)
         return self
 
-    def searchDiscover(self, query, limit=30, libtype=None):
+    def searchDiscover(self, query, limit=30, libtype=None, providers='discover'):
         """ Search for movies and TV shows in Discover.
             Returns a list of :class:`~plexapi.video.Movie` and :class:`~plexapi.video.Show` objects.
 
             Parameters:
                 query (str): Search query.
                 limit (int, optional): Limit to the specified number of results. Default 30.
                 libtype (str, optional): 'movie' or 'show' to only return movies or shows, otherwise return all items.
+                providers (str, optional): 'discover' for default behavior
+                    or 'discover,PLEXAVOD' to also include the Plex ad-suported video service
+                    or 'discover,PLEXAVOD,PLEXTVOD' to also include the Plex video rental service
         """
         libtypes = {'movie': 'movies', 'show': 'tv'}
         libtype = libtypes.get(libtype, 'movies,tv')
@@ -1068,6 +1071,7 @@ def searchDiscover(self, query, limit=30, libtype=None):
             'query': query,
             'limit': limit,
             'searchTypes': libtype,
+            'searchProviders': providers,
             'includeMetadata': 1
         }