Merge pull request #992 from swagger-api/bump-codegen

bump codegen to 3.0.31-SNAPSHOT

Author: frantuma

pom.xml

@@ -254,7 +254,7 @@
         </dependency>
     </dependencies>
     <properties>
-        <swagger-codegen-version>3.0.30</swagger-codegen-version>
+        <swagger-codegen-version>3.0.31-SNAPSHOT</swagger-codegen-version>
         <swagger-parser-version>2.0.28</swagger-parser-version>
         <swagger-core-version>2.1.11</swagger-core-version>
         <jackson-version>2.12.1</jackson-version>