Summary:
Even though it’s not really a source file, and it lives at the
repository root, it might as well have typing to make sure that we don’t
do anything really dumb.
Test Plan:
`yarn flow` still passes.
wchargin-branch: flow-eslintrc
Test Plan:
Run `yarn lint` and `yarn travis` and observe success. Add something
that triggers a lint warning, like `const zzz = 3;`; re-run and observe
failures.
wchargin-branch: lint