Made the type resolver public so I can access its constructor

Author: guy120494

src/test/java/graphql/annotations/GraphQLUnionTest.java

@@ -202,7 +202,7 @@ public Dog(String waf) {
         }
     }
 
-    static class PetResolver implements TypeResolver {
+    public static class PetResolver implements TypeResolver {
         @Override
         public GraphQLObjectType getType(TypeResolutionEnvironment env) {
             Object object = env.getObject();