message: Add allowSecretKey to interface
  Typescript is spitting out errors when I try to use allowSecretKey
diff: @@ -62,6 +62,9 @@ interface RavenOptions {
  /** Override the default HTTP data transport handler. */
  transport?: (options: RavenTransportOptions) => void;
  + /** Allow use of private/secretKey. */
  + allowSecretKey?: boolean;
  +
  /** Enables/disables instrumentation of globals. */
  instrument?: boolean | RavenInstrumentationOptions;
  