Problem
We've crossed into a new year and our copyright ranges are now out of date.
Solution
Update them to 2021.
JIRA Issues: CSL-10577
Differential Revision: https://phabricator.twitter.biz/D606603
cacoco
| Files | Coverage |
|---|---|
| mustache | 85.71% |
| Project Totals (272 files) | 90.22% |