Kill stupid encoding warnings finally

By: Erik Broes <erikbroes@grum.nl>

paper-server/pom.xml

@@ -8,6 +8,7 @@
   <name>CraftBukkit</name>
   <url>http://www.bukkit.org</url>
   <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <api.version>unknown</api.version>
   </properties>
   <scm>