Use the Gradle wrapper for leaner requirements
Use the Gradle wrapper for leaner requirements

There is no need to have a requirement on Gradle if one uses the
Gradle wrapper for building. In addition this makes sure the correct
Gradle version is used.
FlorianLautenschlager/chronix.server,ChronixDB/chronix.server,phxql/chronix.server,ChronixDB/chronix.server