Merge pull request #10 from Wish-Org/feat/add-enumtype-attribute

Fix EnumType attribute generation for non null field and remove GenerateMemberNames option

Author: clement911

GraphQLSharp.Tests/GraphQLTypeGeneratorTests.cs

@@ -40,7 +40,6 @@ public void GenerateShopifyTypes()
                     { ("ShopifyPaymentsDispute", "finalizedOn"), "DateTime" },
                 },
             EnumMembersAsString = true,
-            GenerateMemberNames = true
         };
 
         var generator = new GraphQLTypeGenerator();