title: Unable to install vue-cli using npm
body: <p>I have installed the latest version of <code>npm</code> and with that, I am trying to install <code>vue-cli</code> using the command</p>
  
  <pre><code>npm install --global vue-cli
  </code></pre>
  
  <p>But I am running into issues stated below:</p>
  
  <pre><code>    npm ERR! code EPROTO
  npm ERR! errno EPROTO
  npm ERR! request to http://registry.npmjs.org/vue-cli failed, reason: write EPROTO 101057795:error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol:openssl\ssl\s23_clnt.c:827:
  npm ERR!
  
  npm ERR! A complete log of this run can be found in:
  npm ERR!     C:\Users\pd0ufv\AppData\Roaming\npm-cache\_logs\2018-02-02T17_02_16_113Z-debug.log
  </code></pre>
  
  <p>I have set my proxy setting as well using </p>
  
  <p><code>npm set http-proxy &lt;proxy&gt;</code></p>
  
  <p><code>npm set https-proxy &lt;proxy&gt;</code></p>
  
  <p>but didn't work as well. I am using <code>npm</code> version 5.6.0.</p>