title: VS Code - how to rollback extension/install specific extension version
body: <p>Just got an update for the Golang extension and it appears to be broken, reporting an error on a <code>package main</code> that's literally just a list of my imports with no useful information (see screenshot below). It's refusing to lint or do anything useful which is annoying.</p>
  <p><a href="https://i.stack.imgur.com/o17NX.png" rel="noreferrer"><img src="https://i.stack.imgur.com/o17NX.png" alt="screenshot of error in VS Code" /></a></p>
  <p>So I want to quickly jump back to the previous version, how can I do this in VS Code? I can't seem to find it in the docs at all.</p>
  <p>NB: I'm using VS Code version 1.10.1 with only the golang package. The code is valid golang.</p>