Liblastfm doesn't compile with http-conduit < 1.9

Fails to compile with old versions of http-conduit.

> src/Network/Lastfm/Response.hs:60:16:
>     Couldn't match expected type `C.CookieJar -> e0'
>                 with actual type `C.HttpException'
>     The function `C.StatusCodeException' is applied to three arguments,
>    but its type `C.Status -> C.ResponseHeaders -> C.HttpException'
>    has only two
Merge pull request #20 from RaphaelJ/patch-1

Liblastfm doesn't compile with http-conduit < 1.9