Avoid [WARNING] Using platform encoding

git-svn-id: https://svn.apache.org/repos/asf/mina/ftpserver/trunk@1129848 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index 6ab0f5a..de996fe 100644
--- a/pom.xml
+++ b/pom.xml
@@ -453,5 +453,6 @@
     <maven.compile.source>1.5</maven.compile.source>
     <maven.compile.target>1.5</maven.compile.target>
     <ftpserver.version>${project.version}</ftpserver.version>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
   </properties>
 </project>