travis-settings.xml

<?xml version="1.0" encoding="UTF-8"?>
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<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0">
  <servers>
    <server>
      <id>ossrh</id>
      <username>${env.SONATYPE_USERNAME}</username>
      <password>${env.SONATYPE_PASSWORD}</password>
    </server>
  </servers>
</settings>