title: request to https://registry.npmjs.org/co failed
body: <p>If I do <code>npm install</code> in my repository. I get the below error</p>
  
  <pre><code>npm ERR! code UNABLE_TO_GET_ISSUER_CERT_LOCALLY
  npm ERR! errno UNABLE_TO_GET_ISSUER_CERT_LOCALLY
  npm ERR! request to https://registry.npmjs.org/co failed, reason: unable to get local issuer certificate
  </code></pre>
  
  <p>I tried with</p>
  
  <pre><code>npm config set registry https://registry.npmjs.org/
  </code></pre>
  
  <p>But it does not solve the problem</p>
  
  <p>Please help to resolve this issue.
  Thanks in advance!</p>