title: VSCode: tslint-language-service plugin shows lint hints as error and not warning
body: <p>I am using Visual Studio Code <code>1.12.1</code> with <a href="https://blogs.msdn.microsoft.com/typescript/2017/04/27/announcing-typescript-2-3/" rel="nofollow noreferrer">Typescript</a> <code>2.3.2</code> and the enabled plugin <code>tslint-language-service: 0.9.3</code> with <code>tslint: 5.2.0</code></p>
  
  <p>For some reason all the <code>tslint</code> hints are shown as errors with a red underline. I would like to have it as a warning with a green/yellow underline.</p>
  
  <p>How can I do it? This is the plugin I am using with the new Typescript version <a href="https://github.com/angelozerr/tslint-language-service#vscode" rel="nofollow noreferrer">https://github.com/angelozerr/tslint-language-service#vscode</a></p>
  
  <p>Like in in the demo gif it should be green and not red</p>
  
  <p><a href="https://github.com/angelozerr/tslint-language-service/raw/master/images/TslintLanguageServiceDemoVSCode.gif" rel="nofollow noreferrer">https://github.com/angelozerr/tslint-language-service/raw/master/images/TslintLanguageServiceDemoVSCode.gif</a></p>