Improve installation documentation (For Fedora, zlib-devel is also needed)

[Shenmin-Z]

In Installation part(https://github.com/haskell/haskell-ide-engine/blame/master/README.md#L170), it says

Fedora:

sudo dnf install libicu-devel ncurses-devel

In my experience, zlib-devel is not installed by default and is needed in the building process, otherwise there would be error like While building package digest-0.0.1.2 .

[jneira]

Thanks for reporting, could you make a pr to improve the README?

[Shenmin-Z]

#1472

Not sure if I put it in the right place...

[jneira]

closed by #1472, thanks for the update!

[JohnTasto]

zlib1g-dev is needed in Ubuntu 20.04.

[jneira]

@JohnTasto thanks for pointing it out, are you interested in make a pr wadding it?

[JohnTasto]

#1787

I just followed @Shenmin-Z's lead since I'm not sure that it affects all variants.