Merge pull request #57 from setchy/feature/update-to-v18

chore(deps): Updating to use graphql-java 18.0

Author: bbakerman

build.gradle

@@ -40,7 +40,7 @@ repositories {
 
 
 dependencies {
-    compile "com.graphql-java:graphql-java:17.0"
+    compile "com.graphql-java:graphql-java:18.0"
 
     testImplementation 'org.spockframework:spock-core:1.3-groovy-2.5'
     testImplementation('org.codehaus.groovy:groovy:2.5.13')