message: Add hears_regexp to TypeScript definition.
diff: @@ -87,7 +87,7 @@ declare namespace botkit {
  interface ConsoleSpawnConfiguration {
  }
  interface Controller<S, M extends Message, B extends Bot<S, M>> {
  - readonly changeEars: HearsFunction<M>;
  + readonly hears_regexp: HearsFunction<M>;
  readonly log: {
  (...params: any[]): void;
  }
  @@ -111,6 +111,7 @@ declare namespace botkit {
  teams: Storage<Team>;
  };
  readonly studio: Studio<S, M, B>;
  + changeEars(new_test: HearsFunction<M>): void;
  hears(keywords: string | string[] | RegExp | RegExp[], events: string | string[], cb: HearsCallback<S, M, B>): this;
  hears(keywords: string | string[] | RegExp | RegExp[], events: string | string[], middleware_or_cb: HearsFunction<M>, cb: HearsCallback<S, M, B>): this;
  on(event: string, cb: HearsCallback<S, M, B>): this;
  