[Messenger] Add missing documentation link in README#35409

Merged

nicolas-grekas merged 2 commits intosymfony:4.3from

pyrech:patch-1

Jan 21, 2020

Commits on Jan 21, 2020

[HttpKernel] restore compat with clock mocking
nicolas-grekas
committed
Add link to messenger documentation in its README

pyrech
authored and
nicolas-grekas
committed