def fetch_github_token
      env_var = @options[:token].presence || ENV["CHANGELOG_GITHUB_TOKEN"]

      Helper.log.warn NO_TOKEN_PROVIDED unless env_var

      env_var
    end
def fetch_github_token
      env_var = @options[:token].presence || ENV["CHANGELOG_GITHUB_TOKEN"]

      Helper.log.warn NO_TOKEN_PROVIDED unless env_var

      env_var
    end
Returns GitHub token. First try to use variable, provided by --token option,
 otherwise try to fetch it from CHANGELOG_GITHUB_TOKEN env variable.

 @return [String]