com/android/support/customtabs/maven-metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<metadata>
  <groupId>com.android.support</groupId>
  <artifactId>customtabs</artifactId>
  <versioning>
    <release>26.0.0-beta1</release>
    <versions>
      <version>26.0.0-beta1</version>
    </versions>
    <lastUpdated>20170511000519</lastUpdated>
  </versioning>
</metadata>