Publish release notes for 19.7.0 (#82)
Publish release notes for 19.7.0 (#82)

* add july release notes

* fix formatting in release notes

* remove old version of new release notes

* Update blog with Neuman's toggle change.

Co-Authored-By: Neuman Vong <42d82d8113a504f4f372eb254d38d8bd0015f778@gmail.com>

finagle/finagle.github.io,finagle/finagle.github.io,finagle/finagle.github.io