code: @Nonnull
      public static GitHubPluginConfig configuration() {
          return defaultIfNull(
                  GitHubPluginConfig.all().get(GitHubPluginConfig.class),
                  GitHubPluginConfig.EMPTY_CONFIG
          );
      }
docs: Shortcut method for getting instance of {@link GitHubPluginConfig}.
  
  @return configuration of plugin