to 2.3.1 (#1072)

* to 2.3.1_SNAPSHOT

* to 2.3.1

Author: gaosaroma

pom.xml

@@ -14,7 +14,7 @@
     </modules>
 
     <properties>
-        <sofa.ark.version>2.3.1-SNAPSHOT</sofa.ark.version>
+        <sofa.ark.version>2.3.1</sofa.ark.version>
         <sofa.ark.version.old>2.3.0</sofa.ark.version.old>
         <project.encoding>UTF-8</project.encoding>
         <java.version>1.8</java.version>