fix network-uri flag example in cabal file

[marbu]

Since network-uri module was created when network 2.6 was released,
expression network-uri < 2.6 is not necessary, moreover it will always fail.

[hvr]

Why does it always fail?

[marbu]

In enviroment with network module installed in version 2.4, disabling network-uri flag doesn't help me because I don't have module network-uri in version < 2.6. And I can't satisfy such requirement because module with this name and version doesn't exist.

[hvr]

Are you aware that http://hackage.haskell.org/package/network-uri-2.5.0.0 exists?

[marbu]

Ah, so basically in my enviroment with network-2.4, I need to use dummy network-uri-2.5 you mentioned?

[hvr]

Yes, I think there was some subtle corner cases that motivated the recommendation to force a dummy network-uri. It certainly helps to ensure that inside an install-plan you never end up mixing an older network package with a newer network-uri and vice-versa

[marbu]

Thanks a lot for the clarification. I'm closing this now.