upgrade gql java to 7.0 version

Author: yarinvak

build.gradle

@@ -67,7 +67,7 @@ gradle.projectsEvaluated {
 
 dependencies {
     compile 'javax.validation:validation-api:1.1.0.Final'
-    compile 'com.graphql-java:graphql-java:6.0'
+    compile 'com.graphql-java:graphql-java:7.0'
 
     // OSGi
     compileOnly 'org.osgi:org.osgi.core:6.0.0'