title: Dart versioning - no matching version
body: <p>In my angular2 project I don't manage to add the "google_maps: 3.1.0" dependency. 
  It seems that this library is in conflict with "angular2: 2.0.0-beta.20".</p>
  
  <p>The error message is :</p>
  
  <pre><code>Package code_transformers has no versions that match &gt;=0.4.1 &lt;0.5.0 derived from:
  - build 0.3.0 depends on version ^0.4.1
  </code></pre>
  
  <p>However, "google_maps: 3.1.0" do not contain "code_transformers" or "build" package in its dependencies and transitive dependencies.</p>
  
  <p>Thanks for your help.</p>