Added another endpoint and made sure the logger works for bodys <50 chars

SpotifyAPI.Web/Clients/Interfaces/IPlaylistsClient.cs

@@ -27,5 +27,7 @@ namespace SpotifyAPI.Web
 
     Task<Paging<SimplePlaylist>> CurrentUsers();
     Task<Paging<SimplePlaylist>> CurrentUsers(PlaylistCurrentUsersRequest request);
+
+    Task<bool> ChangeDetails(string playlistId, PlaylistChangeDetailsRequest request);
   }
 }

SpotifyAPI.Web/Clients/PlaylistsClient.cs

@@ -117,5 +117,14 @@ namespace SpotifyAPI.Web
 
       return API.Get<Paging<SimplePlaylist>>(URLs.CurrentUserPlaylists(), request.BuildQueryParams());
     }
+
+    public async Task<bool> ChangeDetails(string playlistId, PlaylistChangeDetailsRequest request)
+    {
+      Ensure.ArgumentNotNullOrEmptyString(playlistId, nameof(playlistId));
+      Ensure.ArgumentNotNull(request, nameof(request));
+
+      var statusCode = await API.Put(URLs.Playlist(playlistId), null, request.BuildBodyParams());
+      return statusCode == HttpStatusCode.OK;
+    }
   }
 }

SpotifyAPI.Web/Http/SimpleHTTPLogger.cs

@@ -17,7 +17,8 @@ namespace SpotifyAPI.Web.Http
 
     public void OnResponse(IResponse response)
     {
-      string body = response.Body?.ToString().Substring(0, 50).Replace("\n", "");
+      string body = response.Body?.ToString().Replace("\n", "");
+      body = body?.Substring(0, Math.Min(50, body?.Length ?? 0));
       Console.WriteLine("--> {0} {1} {2}\n", response.StatusCode, response.ContentType, body);
     }
   }

SpotifyAPI.Web/Models/Request/PlaylistChangeDetailsRequest.cs

@@ -0,0 +1,17 @@
+namespace SpotifyAPI.Web
+{
+  public class PlaylistChangeDetailsRequest : RequestParams
+  {
+    [BodyParam("name")]
+    public string Name { get; set; }
+
+    [BodyParam("public")]
+    public bool? Public { get; set; }
+
+    [BodyParam("collaborative")]
+    public bool? Collaborative { get; set; }
+
+    [BodyParam("description")]
+    public string Description { get; set; }
+  }
+}