修复motan序列化时不能使用bigdecimal的bug

pom.xml

@@ -224,8 +224,17 @@
                     <groupId>org.slf4j</groupId>
                     <artifactId>slf4j-log4j12</artifactId>
                 </exclusion>
+                <exclusion>
+                    <groupId>com.caucho</groupId>
+                    <artifactId>hessian</artifactId>
+                </exclusion>
             </exclusions>
         </dependency>
+        <dependency>
+            <groupId>cn.quantgroup</groupId>
+            <artifactId>hession-bugfix</artifactId>
+            <version>4.0.38</version>
+        </dependency>
         <dependency>
             <groupId>com.weibo</groupId>
             <artifactId>motan-transport-netty</artifactId>