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

<?xml version="1.0" encoding="UTF-8"?>
<metadata>
  <groupId>com.android.support</groupId>
  <artifactId>recommendation</artifactId>
  <version>23.0.1</version>
  <versioning>
    <versions>
      <version>23.0.1</version>
      <version>23.1.0</version>
    </versions>
    <lastUpdated>20151015204833</lastUpdated>
  </versioning>
</metadata>