remove outdated references from cabal file

pontarius-xmpp.cabal

@@ -11,7 +11,6 @@ Maintainer:    info@jonkri.com
 Stability:     alpha
 Homepage:      https://github.com/pontarius/pontarius-xmpp/
 Bug-Reports:   https://github.com/pontarius/pontarius-xmpp/issues/
-Package-URL:   http://www.jonkri.com/releases/pontarius-xmpp-0.4.3.tar.gz
 Synopsis:      An XMPP client library
 Description:   Pontarius XMPP is a work in progress implementation of RFC 6120
                ("XMPP CORE"), RFC 6121 ("XMPP IM"), and RFC 6122 ("XMPP ADDR").
@@ -209,8 +208,3 @@ benchmark benchmarks
 Source-Repository head
   Type: git
   Location: git://github.com/pontarius/pontarius-xmpp.git
-
-Source-Repository this
-  Type: git
-  Location: git://github.com/pontarius/pontarius-xmpp.git
-  Tag: 0.4.2.2