Remove eq and show from num class

[Herbert Valerio Riedel]

"yes" :-)

Btw, here's an old commit which updates the class diagram to this
effect for the report:

https://github.com/hvr/haskell-report/commit/339ea257ee8b0451fbba388480566efac6ecbbd3

On Thu, Sep 7, 2017 at 5:43 PM, Carter Schonwald
<carter.schonwald at gmail.com> wrote:
> All yays from committee members please reply with yes to this email :)
>
> -Carter
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