update gradle and spring

gradle to 4.6
spring to 1.5.10.RELEASE

build.gradle

@@ -10,6 +10,7 @@ buildscript {
   }
 
   dependencies {
+  	// usage: gradle dependencyUpdates -Drevision=release
     classpath 'com.github.ben-manes:gradle-versions-plugin:0.17.0'
   }
 }
@@ -50,5 +51,5 @@ subprojects {
 }
 
 task wrapper(type: Wrapper) {
-    gradleVersion = '4.4'
+    gradleVersion = '4.6'
 }