Merge pull request #140 from gocd-contrib/dependabot/gradle/junit-junit-4.13

Bump junit from 4.12 to 4.13

Author: ketan

build.gradle

@@ -66,7 +66,7 @@ dependencies {
   compile group: 'commons-io', name: 'commons-io', version: '2.6'
   compile group: 'org.freemarker', name: 'freemarker', version: '2.3.29'
 
-  testCompile group: 'junit', name: 'junit', version: '4.12'
+  testCompile group: 'junit', name: 'junit', version: '4.13'
   testCompile group: 'org.hamcrest', name: 'hamcrest-library', version: '2.1'
   testCompile group: 'org.mockito', name: 'mockito-core', version: '3.3.0'
   testCompile group: 'org.skyscreamer', name: 'jsonassert', version: '1.5.0'