add changelog

changelog.md

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+* 0.3 to 0.4
+
+** Major changes
+Added Lenses
+Added Plugins
+
+** newly exported functions
+simpleAuth
+jid (QuasiQuoter)
+presenceUnsubscribed
+associatedErrorType
+mkStanzaError
+
+** major bugs fixed
+Didn't check jid of IQResults
+
+** incompatible changes
+*** IQ
+sendIQ returns an STM action rather than a TMVar
+sendIQ' takes a timeout parameter
+removed IQResponseTimeout from IQResponse data type
+renamed listenIQChan to listenIQ and changed return type from TChan to STM
+renamed dropIQChan to unlistenIQ