title: go error plugin when running heroku login on windows 10
body: <p>I just downloaded and updated Heroku, and then ran</p>
  <pre><code>&gt; heroku login
  </code></pre>
  <p>in my PowerShell, but got the following error:</p>
  <pre><code>(node:1496) [UNKNOWN] Error Plugin: heroku: UNKNOWN: unknown error, open 'U:\_netrc'
  Error occurred during reading netrc file: U:\_netrc
  module: @oclif/config@1.13.2
  task: runHook prerun
  plugin: heroku
  root: C:\Users\&lt;myusername&gt;\AppData\Local\heroku\client\7.59.2
  See more details with DEBUG=*
  Error: UNKNOWN: unknown error, open 'U:/_netrc'
  </code></pre>
  <p>I couldn't find much information about the error message, and would appreciate any insights or suggestions. Thank you!</p>