Add ALE to the README Installation section

[w0rp]

ALE Now supports bash-language-sever out of the box, if installed, and requires no configuration for it to start running.

[skovhus]

Nice! Do you have time to submit a PR? :)

[w0rp]

I don't have the time myself.

[keith]

Submitted here #64

[mads-hartmann]

Fixed in #64