title: lerna add : No packages found where <package> can be added
body: <p>have added lerna to my project, i have added a package to my server by running this command successfully:</p>
  <pre><code> lerna add  @types/express --dev
  </code></pre>
  <p>But when I want to add another one:</p>
  <pre><code>lerna add graphql class-validator type-graphql
  </code></pre>
  <p>I got this error :</p>
  <pre><code>info cli using local version of lerna
  lerna notice cli v3.22.1
  lerna WARN No packages found where graphql can be added. 
  </code></pre>
  <ol>
  <li>Is something missed or wrong for adding the packages?</li>
  <li>Should I use <code>yarn add</code> instead of <code>leran add</code>? looks it works but I doubt about the packages tree form to be correct</li>
  </ol>