Added dependency on GSON (required in 10th iteration)

pom.xml

@@ -34,6 +34,12 @@
             <version>${version.assertj}</version>
             <scope>test</scope>
         </dependency>
+        <!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
+        <dependency>
+            <groupId>com.google.code.gson</groupId>
+            <artifactId>gson</artifactId>
+            <version>2.8.5</version>
+        </dependency>
     </dependencies>
     <build>
         <plugins>