Update dependency prettier to ^1.19.1 (!6537) · Merge requests · Administrator / sourcegraph · GitLab

Administrator requested to merge web/update-prettier-1.19.1 into master Nov 11, 2019

Created by: ghost

Updated prettier, mainly to support TypeScript 3.7 syntax
Ran yarn prettier for fixes

Let me know if this should be done in a different way 🙂