update plugin

Author: HSGamer

pom.xml

@@ -6,12 +6,12 @@
 
     <groupId>me.hsgamer.bettergui</groupId>
     <artifactId>addon-parent</artifactId>
-    <version>3.0</version>
+    <version>3.1</version>
     <packaging>pom</packaging>
 
     <properties>
         <java.version>1.8</java.version>
-        <plugin.version>9.0</plugin.version>
+        <plugin.version>9.1</plugin.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>