fix equalsVerifier

- add prefab values for RE2 Pattern

Author: rkeytacked

core/src/test/java/org/everit/json/schema/ObjectSchemaTest.java

@@ -22,6 +22,7 @@
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
+import com.google.re2j.Pattern;
 import java.util.List;
 import java.util.concurrent.Callable;
 
@@ -357,6 +358,7 @@ public void equalsVerifier() {
         EqualsVerifier.forClass(ObjectSchema.class)
                 .withRedefinedSuperclass()
                 .withIgnoredFields("schemaLocation")
+                .withPrefabValues(Pattern.class, Pattern.compile("red"), Pattern.compile("black"))
                 .suppress(Warning.STRICT_INHERITANCE)
                 .verify();
     }

core/src/test/java/org/everit/json/schema/StringSchemaTest.java

@@ -15,6 +15,7 @@
  */
 package org.everit.json.schema;
 
+import com.google.re2j.Pattern;
 import nl.jqno.equalsverifier.EqualsVerifier;
 import nl.jqno.equalsverifier.Warning;
 import org.everit.json.schema.loader.SchemaLoader;
@@ -116,6 +117,7 @@ public void equalsVerifier() {
         EqualsVerifier.forClass(StringSchema.class)
                 .withRedefinedSuperclass()
                 .withIgnoredFields("schemaLocation")
+                .withPrefabValues(Pattern.class, Pattern.compile("red"), Pattern.compile("black"))
                 .suppress(Warning.STRICT_INHERITANCE)
                 .verify();
     }