Update README.md

httpclient-simple/src/main/java/com/baeldung/spring/WebConfig.java

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+package com.baeldung.spring;
+
+import java.util.List;
+
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.http.converter.HttpMessageConverter;
+import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
+import org.springframework.web.servlet.config.annotation.EnableWebMvc;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+@Configuration
+@EnableWebMvc
+@ComponentScan("com.baeldung.web")
+public class WebConfig implements WebMvcConfigurer {
+
+    public WebConfig() {
+        super();
+    }
+
+    // beans
+
+    @Override
+    public void configureMessageConverters(final List<HttpMessageConverter<?>> converters) {
+        converters.add(new MappingJackson2HttpMessageConverter());
+    }
+
+    //
+
+}