useOptionalForNullableReturnTypes conflicts with apiReturnType (Version: 4.0.0)

[dsilvasc]

Issue Description

If you set both useOptionalForNullableReturnTypes and apiReturnType to true, the generator ignores apiReturnType.

Steps to Reproduce

tasks.named<io.github.kobylynskyi.graphql.codegen.gradle.GraphQLCodegenGradleTask>("graphqlCodegen") {
  ...
  apiReturnType = "java.util.concurrent.CompletionStage"
  useOptionalForNullableReturnTypes = true
}

Expected Result

@javax.annotation.Generated(
    value = "com.kobylynskyi.graphql.codegen.GraphQLCodegen",
    date = "2020-11-30T13:39:15+0000"
)
public interface QueryResolver {

    java.util.concurrent.CompletionStage<java.util.Optional<Publisher>> example(String id, graphql.schema.DataFetchingEnvironment env) throws Exception;

}

Actual Result

@javax.annotation.Generated(
    value = "com.kobylynskyi.graphql.codegen.GraphQLCodegen",
    date = "2020-11-30T13:39:15+0000"
)
public interface QueryResolver {

    java.util.Optional<Publisher> example(String id, graphql.schema.DataFetchingEnvironment env) throws Exception;

}

Your Environment and Setup

• graphql-java-codegen: 4.0.0
• Build tool: Gradle
• Java tool: 1.8.0_242
• Mapping Config: see above

[kobylynskyi]

@dsilvasc, version 4.0.1 with this fix was released today.

[dsilvasc]

Awesome, thank you :)