Pin antlr-runtime dependency to 3.2 (#266)

This resolves "Caused by: java.lang.NoSuchFieldError: EOF_TOKEN
        at org.eclipse.xtext.parser.antlr.Lexer.nextToken(Lexer.java:60)"
so that integration tests pass again.

Author: dr0i

build.gradle

@@ -34,6 +34,7 @@ subprojects {
   ext {
     versions = [
       'ace':            '1.3.3',
+      'antlr':          '3.2',
       'equalsverifier': '3.8.2',
       'jackson':        '2.13.3',
       'jetty':          '9.4.14.v20181114',

metafix-runner/build.gradle

@@ -9,6 +9,10 @@ dependencies {
   implementation "org.metafacture:metafacture-json:${versions.metafacture}"
   implementation "org.metafacture:metafacture-runner:${versions.metafacture}"
   implementation "org.metafacture:metafacture-xml:${versions.metafacture}"
+
+  implementation('org.antlr:antlr-runtime') {
+    version { strictly versions.antlr }
+  }
 }
 
 application {