feat : GraphQL Context 구현체 추가

놀이터(예제 코드 작성)/graphql-kotlin/src/main/kotlin/com/banjjoknim/graphqlkotlin/GraphQLContextFactory.kt

@@ -23,7 +23,9 @@ import org.springframework.web.reactive.function.server.ServerRequest
  */
 @Component
 class GraphQLContextFactory : DefaultSpringGraphQLContextFactory() {
-    override suspend fun generateContextMap(request: ServerRequest): Map<*, Any> = super.generateContextMap(request) + mapOf(
+    override suspend fun generateContextMap(request: ServerRequest): Map<*, Any> {
+        return super.generateContextMap(request) + mapOf(
             "myCustomValue" to (request.headers().firstHeader("MyHeader") ?: "defaultContext")
         )
     }
+}