fixes #11 refactor using openapi-helper

Author: stevehu

pom.xml

@@ -59,6 +59,7 @@
         <version.json-schema-validator>1.0.44</version.json-schema-validator>
         <version.light-4j>2.0.22-SNAPSHOT</version.light-4j>
         <version.jackson>2.10.4</version.jackson>
+        <version.snakeyaml>1.26</version.snakeyaml>
         <version.slf4j>1.7.30</version.slf4j>
         <version.common-lang3>3.5</version.common-lang3>
         <version.logback>1.2.3</version.logback>
@@ -88,6 +89,11 @@
             <artifactId>jackson-databind</artifactId>
             <version>${version.jackson}</version>
         </dependency>
+        <dependency>
+            <groupId>org.yaml</groupId>
+            <artifactId>snakeyaml</artifactId>
+            <version>${version.snakeyaml}</version>
+        </dependency>
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>