title: Are there npm version prerelease identifiers?
body: <p>There is a very handy <a href="https://docs.npmjs.com/cli/version" rel="noreferrer"><code>npm version</code></a> command. Besides arguments like <code>major</code>, <code>minor</code> and <code>patch</code> it accepts arguments like <code>prerelease</code>, <code>prepatch</code>, etc.<br>
  It says in the docs that the commands work in accordance with the <a href="https://github.com/npm/node-semver#functions" rel="noreferrer"><code>semver.inc</code></a> function.</p>
  
  <p>These <code>pre</code> commands I have a question about.</p>
  
  <p>Say I'm currently at version <code>v1.0.0</code>.<br>
  If I run <code>npm version prerelease</code> it will bump version to <code>v1.0.1-0</code>.</p>
  
  <p>Is it possible to provide an extra agrument for a prerelease identifier according to <a href="https://github.com/npm/node-semver#prerelease-identifiers" rel="noreferrer">https://github.com/npm/node-semver#prerelease-identifiers</a>?</p>
  
  <p>I wish something like <code>npm version prerelease alpha</code> would bump version to <code>v1.0.1-alpha.0</code> but that doesn't work.</p>