message: Update pull-requests.ts
  fix misspelling
diff: @@ -366,7 +366,7 @@ export class MergePullRequest extends PullRequestCommand {
  }
  } else {
  vscode.window.showWarningMessage(
  - 'Either no pull request for current brach, or the pull request is not mergable'
  + 'Either no pull request for current branch, or the pull request is not mergable'
  );
  }
  }
  