message: Update: remove unused import
diff: -import { exec } from 'child_process';
  -import { ModeName, Mode } from '../../mode/mode';
  -import { existsSync, exists } from 'fs';
  +import { ModeName } from '../../mode/mode';
  +import { existsSync } from 'fs';
  import { configuration } from '../../configuration/configuration';
  -import * as vscode from 'vscode';
  import * as util from '../../util/util';
  import { Message } from '../../util/message';
  