Merge pull request #225 from emesika/bump-4-4-31

bump sdk model to 4.4.31

Author: emesika

pom.xml

@@ -65,7 +65,7 @@ limitations under the License.
 
     <!-- Version of the metamodel and model used to generate the SDK: -->
     <metamodel.version>1.3.4</metamodel.version>
-    <model.version>4.4.28</model.version>
+    <model.version>4.4.31</model.version>
 
     <!-- The command used to start Go: -->
     <go.command>go</go.command>