adds some deprecations

lib/src/endpoints/artists.dart

@@ -20,8 +20,12 @@ class Artists extends EndpointPaging {
 
   /// Returns the top tracks of an artist with its [artistId] inside a [country]
   @Deprecated('Use [topTracks] instead')
-  Future<Iterable<Track>> getTopTracks(String artistId, Market country) async =>
-      topTracks(artistId, country);
+  Future<Iterable<Track>> getTopTracks(String artistId, String country) {
+    var contains = Market.values.asNameMap().containsKey(country);
+    assert(contains == true,
+        'The country code $country does not match with any Market enum value');
+    return topTracks(artistId, Market.values.asNameMap()[country]!);
+  }
 
   /// Returns the top tracks of an artist with its [artistId] inside a [country]
   Future<Iterable<Track>> topTracks(String artistId, Market country) async {

lib/src/endpoints/browse.dart

@@ -13,7 +13,17 @@ class Browse extends EndpointPaging {
   /// parameter if you want to narrow the list of returned new releases to those
   /// relevant to a particular country. If omitted, the returned items will be
   /// globally relevant.
-  Pages<AlbumSimple> getNewReleases({Market? country}) {
+  @Deprecated('Use [newReleases] instead')
+  Pages<AlbumSimple> getNewReleases({String? country}) =>
+      newReleases(country: Market.values.asNameMap()[country]);
+
+  /// Returns the new releases.
+  ///
+  /// [country] - a country: an ISO 3166-1 alpha-2 country code. Provide this
+  /// parameter if you want to narrow the list of returned new releases to those
+  /// relevant to a particular country. If omitted, the returned items will be
+  /// globally relevant.
+  Pages<AlbumSimple> newReleases({Market? country}) {
     var params = _buildQuery({'country': country?.name});
 
     return _getPages(