upgrade fastjson

pom.xml

@@ -147,7 +147,7 @@
             <dependency>
                 <groupId>com.alibaba</groupId>
                 <artifactId>fastjson</artifactId>
-                <version>1.2.76</version>
+                <version>1.2.78</version>
             </dependency>
             <dependency>
                 <groupId>org.json</groupId>