updating gradle wrapper (to version 4.2)

CHANGELOG.md

 Upcoming version:
 -----------------
+  - updating gradle wrapper (to version 4.2) (Nikolaus Krismer)
   - renamed schedule batching access method (Nikolaus Krismer)
   - resetting test option (fixes task) (Nikolaus Krismer)
   - added schedule batching (can be configured in dataset configuration) and disabled datasets (used only on explicit forcing) (Nikolaus Krismer)

gradle/wrapper/gradle-wrapper.properties

+distributionUrl=https\://services.gradle.org/distributions/gradle-4.2-bin.zip
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME