Update antlr4 from 4.7.1 to 4.7.2

Author: tinnou

build.gradle

@@ -49,11 +49,11 @@ jar {
 }
 
 dependencies {
-    compile 'org.antlr:antlr4-runtime:4.7.1'
+    compile 'org.antlr:antlr4-runtime:4.7.2'
     compile 'org.slf4j:slf4j-api:' + slf4jVersion
     compile 'com.graphql-java:java-dataloader:2.1.1'
     compile 'org.reactivestreams:reactive-streams:' + reactiveStreamsVersion
-    antlr "org.antlr:antlr4:4.7.1"
+    antlr "org.antlr:antlr4:4.7.2"
     testCompile group: 'junit', name: 'junit', version: '4.12'
     testCompile 'org.spockframework:spock-core:1.1-groovy-2.4'
     testCompile 'org.codehaus.groovy:groovy-all:2.4.13'