Update addons-parent-pom to 18

Author: halaya

pom.xml

@@ -26,7 +26,7 @@
   <parent>
     <artifactId>addons-parent-pom</artifactId>
     <groupId>io.meeds.addons</groupId>
-    <version>18-RC01</version>
+    <version>18</version>
     <relativePath/>
   </parent>
   <groupId>io.meeds.gamification-crowdin</groupId>