There is a typo in the URL to the proposal, here is the pull request for 177:

https://github.com/ghc-proposals/ghc-proposals/pull/177

On Fri, Mar 29, 2019 at 4:23 PM Joachim Breitner <mail@joachim-breitner.de> wrote:
Dear Committee,

this is your secretary speaking:

Simple constrained type families
has been proposed by Alex Williams
https://github.com/ghc-proposals/ghc-proposals/pull/117
https://github.com/typedrat/ghc-proposals/blob/constrained-type-families/proposals/0000-simple-constrained-type-families.rst

I propose Vitaly as the Shepherd.

Please reach consensus as described in
https://github.com/ghc-proposals/ghc-proposals#committee-process
I suggest you make a recommendation, in a new e-mail thread with the
proposal number in the subject, about the decision, maybe point out
debatable points, and assume that anyone who stays quiet agrees with
you.

Thanks,
Joachim
--
Joachim Breitner
  mail@joachim-breitner.de
  http://www.joachim-breitner.de/

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