change minimum version

Author: Hanashi

package.xml

@@ -13,12 +13,8 @@
 		<authorurl>https://github.com/eXo-OpenSource/wsc-api</authorurl>
 	</authorinformation>
 	<requiredpackages>
-		<requiredpackage minversion="3.0.0">com.woltlab.wcf</requiredpackage>
+		<requiredpackage minversion="6.0.2">com.woltlab.wcf</requiredpackage>
 	</requiredpackages>
-	<compatibility>
-		<api version="2018"/>
-		<api version="2019"/>
-	</compatibility>
 	<instructions type="install">
 		<instruction type="file"/>
 		<instruction type="language"/>