Update to spring-boot 1.5.18 & spring 4.3.21

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Author: erichelgeson

build.gradle

@@ -48,11 +48,11 @@ ext {
     slf4jVersion = "1.7.25"
 
     spockVersion = '1.1-groovy-2.4'
-    springBootVersion = "1.5.17.RELEASE"
+    springBootVersion = "1.5.18.RELEASE"
     springLoadedVersion = "1.2.8.RELEASE"
     directoryWatcherVersion = "0.5.1"
     springLoadedCommonOptions = "-Xverify:none -Dspringloaded.synchronize=true -Djdk.reflect.allowGetCallerClass=true"
-    springVersion = "4.3.20.RELEASE"
+    springVersion = "4.3.21.RELEASE"
     junitVersion = "4.12"
     concurrentlinkedhashmapVersion = "1.4.2"
     cglibVersion = "2.2.2"