Updating gradle version in genjava_project template.

Author: Juan Ignacio Ubeira

src/genjava/templates/genjava_project/build.gradle.in

@@ -15,7 +15,7 @@
  */
 
 task wrapper(type: Wrapper) {
-    gradleVersion = '3.5.1'
+    gradleVersion = '4.10.2'
 }
 
 buildscript {