remove unnecessary versions

Author: wreulicke

gradle.properties

@@ -1,20 +1,11 @@
 # dependency versions
 springBootVersion = 1.5.9.RELEASE
-springVersion = 4.3.13.RELEASE
-springSecurityVersion = 4.2.3.RELEASE
-springRetryVersion = 1.2.1.RELEASE
 springSecurityOauth2Version = 2.2.1.RELEASE
-springDataVersion = 1.12.11.RELEASE
-springHateoasVersion = 0.19.0.RELEASE
 awsJavaSdkVersion = 1.11.233
-jacksonVersion = 2.7.2
 
 lombokVersion = 1.16.18
 baseunitsVersion = 2.14
 
-slf4jVersion = 1.7.25
-logbackVersion = 1.1.11
-
 junitVersion = 4.12
 hamcrestVersion = 1.3
 mockitoCoreVersion = 1.9.5