Fix broken Slack link in Quic github readme file
Fix broken Slack link in Quic github readme file

Summary: as title

Reviewed By: mjoras

Differential Revision: D18696705

fbshipit-source-id: 089aaf6a29b06544e0d3f96add382fc5419974b9

facebookincubator/mvfst,facebookincubator/mvfst,facebookincubator/mvfst,facebookincubator/mvfst,facebookincubator/mvfst