构建失败评论更换红色图标，更容易辨别构建成或失败

pom.xml

@@ -14,7 +14,7 @@
   </properties>
 
   <artifactId>gitee-jenkins-plugin</artifactId>
-  <version>1.0.3-SNAPSHOT</version>
+  <version>1.0.4-SNAPSHOT</version>
   <name>Gitee Jenkins Plugin</name>
   <url>https://wiki.jenkins-ci.org/display/JENKINS/Gitee+Jenkins+Plugin</url>
   <packaging>hpi</packaging>

src/main/java/com/gitee/jenkins/publisher/GiteeMessagePublisher.java

@@ -178,7 +178,7 @@ public class GiteeMessagePublisher extends MergeRequestNotifier {
         } else if (result == Result.UNSTABLE) {
             return ":warning:";
         } else {
-            return ":negative_squared_cross_mark:";
+            return ":x:";
         }
     }