Add missing groovy dependency to build.gradle

Author: sietseringers

build.gradle

@@ -38,6 +38,8 @@ dependencies {
     compile 'ch.qos.logback:logback-classic:1.1.7'
     compile 'org.apache.httpcomponents:httpclient:4.5.3'
 
+    runtime 'org.codehaus.groovy:groovy:2.4.15'
+
     providedCompile 'javax.servlet:javax.servlet-api:3.1.0'
 
     testCompile "junit:junit:4.11"