Removed reference to PeriodicTable.

diff --git a/.pkgmeta b/.pkgmeta
index 7c0584f..6b702e5 100644
--- a/.pkgmeta
+++ b/.pkgmeta
@@ -36,9 +36,6 @@ externals:
     Libs/LibDataBroker-1.1:
         url: git://github.com/tekkub/libdatabroker-1-1.git
         tag: latest
-    Libs/LibPeriodicTable-3.1:
-        url: svn://svn.wowace.com/wow/libperiodictable-3-1/mainline/trunk
-        tag: latest
     Libs/LibLogger-1.0:
         url: svn://svn.wowace.com/wow/liblogger-1-0/mainline/trunk/LibLogger-1.0
         tag: latest