[Java] Upgrade to Gradle 4.0.1.

Author: mjpt777

build.gradle

@@ -604,6 +604,6 @@ task uploadToMavenCentral {
 }
 
 task wrapper(type: Wrapper) {
-    gradleVersion = '4.0'
+    gradleVersion = '4.0.1'
     distributionType = 'ALL'
 }

gradle/wrapper/gradle-wrapper.jar

@@ -1,6 +1,6 @@
-#Sat Jun 17 16:47:24 BST 2017
+#Sat Jul 08 13:40:37 BST 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.0-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.0.1-all.zip