message: Update user.ts
  Fix misspelling
diff: @@ -63,7 +63,7 @@ export class AddAssignee extends UserCommand {
  vscode.window.showInformationMessage(`Successfully assigned ${user} to the pull request`);
  }
  } else {
  - vscode.window.showWarningMessage('No pull request for current brach');
  + vscode.window.showWarningMessage('No pull request for current branch');
  }
  }
  