update to gradle-4.6-all

gradle/wrapper/gradle-wrapper.properties

@@ -3,5 +3,5 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip
-distributionSha256Sum=7a2c66d1a78f811d5f37d14630ad21cec5e77a2a4dc61e787e2257a6341016ce
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-all.zip
+distributionSha256Sum=9af7345c199f1731c187c96d3fe3d31f5405192a42046bafa71d846c3d9adacb