Prepare for the beta3 release

Author: xillibit

src/pkg_kunena.xml

@@ -4,7 +4,7 @@
     <name>pkg_kunena</name>
     <packagename>kunena</packagename>
     <version>6.4.0-BETA3</version>
-    <versionname>INTERNAL</versionname>
+    <versionname>BETA3</versionname>
     <creationDate>@kunenaversiondate@</creationDate>
     <author>Kunena Team</author>
     <authorEmail>[email protected]</authorEmail>