Update to gradle 4.10 and Maven 3.5.4

.mvn/wrapper/maven-wrapper.properties

@@ -1 +1 @@
-distributionUrl=https://repo1.maven.org/maven2/org/apache/maven/apache-maven/3.5.2/apache-maven-3.5.2-bin.zip
+distributionUrl=https://repo1.maven.org/maven2/org/apache/maven/apache-maven/3.5.4/apache-maven-3.5.4-bin.zip

README.md

@@ -55,6 +55,9 @@ Type:
 
 Open the generated project in IDEA. You should now be able to build the project, and to run the specs like you would run a JUnit test.
 
+NOTE: you might also want to install https://github.com/mycila/gmavenplus-intellij-plugin so that `src/test/groovy` is correctly recognized
+      as a test classes root.
+
 Getting hold of the Jars used in this project
 ---------------------------------------------
 Type:

gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.4.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.2.1-bin.zip