upgrade swagger ui

pom.xml

@@ -96,7 +96,7 @@
             <dependency>
                 <groupId>com.github.xiaoymin</groupId>
                 <artifactId>swagger-bootstrap-ui</artifactId>
-                <version>1.8.8</version>
+                <version>1.8.9</version>
             </dependency>
             <dependency>
                 <groupId>com.upyun</groupId>