message: do not use --stdio argument anymore
diff: @@ -294,7 +294,6 @@ export class OmniSharpServer {
  let args = [
  '-s', solutionPath,
  '--hostPID', process.pid.toString(),
  - '--stdio',
  'DotNet:enablePackageRestore=false',
  '--encoding', 'utf-8',
  '--loglevel', options.loggingLevel
  