bump to Gradle5

Author: rogerhu

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Mon Jan 28 10:39:02 PST 2019
+#Sun Aug 11 22:16:42 PDT 2019
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.1.1-all.zip