defaultConfig is missing two fields: cAddr and cNick, which the user of the library must specify. If the user forgets this, a run time error will occur. Using the function mkDefaultConfig, we let the type system ensure that the user only uses complete configs. Because this introduces an API incompatibility, this patch also bumps the major version number according to the cabal PVP.
… IrcConfig, plumbs it through to greetServer