7.8 branch is created, HEAD is now open, and a note on merges

[Kazu Yamamoto (=?iso-2022-jp?B?GyRCOzNLXE9CSScbKEI=?=)]

Hello Herbert,

> Hello Kazu,
> 
> ..as this is a Cabal issue, this needs to be handled upstream; could you
> please file an issue at
> 
>   https://github.com/haskell/cabal/issues/new

Done.

	https://github.com/haskell/cabal/issues/1660

--Kazu