title: What does the ^ mean for spec attribute in PhoneGap plugin?
body: <p>For example, I'm using <code>&lt;plugin name="phonegap-plugin-push" spec="^2.0.0" source="npm"&gt;</code> in my config.xml to add the push plugin and then build my application with PhoneGap Build.</p>
  
  <p>What does the <code>^</code> mean?</p>
  
  <p>I <a href="http://docs.phonegap.com/phonegap-build/configuring/plugins/#plugin-version" rel="nofollow noreferrer">found</a> that <code>~</code> means "greater or equal to" but can't find for the <code>^</code></p>
  
  <p>Thanks in advance for any clarification !</p>