Updating gradle to the latest version

Author: rpmoore

build.gradle

@@ -64,7 +64,7 @@ subprojects {
 }
 
 task wrapper(type: Wrapper) {
-    gradleVersion = '4.6'
+    gradleVersion = '4.7'
 }
 
 project(':ds3-sdk') {

gradle/wrapper/gradle-wrapper.jar

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.7-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-bin.zip