update gradle to 4.7

build.gradle

@@ -11,7 +11,7 @@ subprojects {
 	apply plugin: 'maven-publish'
 
 	// java compatibility version
-	sourceCompatibility = 1.8
+	sourceCompatibility = 10
 	
 	configurations {
 		tests
@@ -52,5 +52,5 @@ subprojects {
 }
 
 task wrapper(type: Wrapper) {
-	gradleVersion = '4.4.1'
+	gradleVersion = '4.7'
 }