[Java] Upgrade to Gradle 3.5.

Author: mjpt777

build.gradle

@@ -566,6 +566,6 @@ task uploadToMavenCentral {
 }
 
 task wrapper(type: Wrapper) {
-    gradleVersion = '3.4.1'
+    gradleVersion = '3.5'
     distributionType = 'ALL'
 }

gradle/wrapper/gradle-wrapper.jar

@@ -1,6 +1,6 @@
-#Tue Mar 14 14:10:28 GMT 2017
+#Tue Apr 11 09:34:32 BST 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.4.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.5-all.zip