Please provide a description of the bug / issue, and provide the details below:

After #284 has been merged, when closing the dashboard process using Ctrl-C, the node process which runs the dev server stays alive.

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If the issue is visual, please provide screenshots here

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More Details

• What operating system are you on?
  Windows 10
• What terminal application are you using?
  PowerShell
• What version of webpack-dashboard are you using?
  3.0.7
• What is the output of running echo $TERM?