Ports: Bump version of the "vttest" port

Ports/vttest/package.sh

@@ -1,5 +1,5 @@
 #!/bin/bash ../.port_include.sh
 port=vttest
-version=20200303
+version=20200610
 useconfigure=true
 files="https://invisible-island.net/datafiles/release/vttest.tar.gz vttest.tar.gz"