Bump gradle version to 5.1.1

misc/ide/jetbrains/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Sun Mar 31 16:34:43 PDT 2019
+#Wed Aug 21 13:47:30 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