fix(PM-716): used promisify instead of sync file read API

[hentrymartin]

What's in this PR?

• Used promisify instead of sync file read API which should resolve path manipulation issue.

[kkartunov]

@hentrymartin we need to keep eye on this and avoid errors like "cannot read property 'stat' of undefined".
See: 542b81e
Not sure if related to promisify or fs module but we had this issue in production when released v1 security fixes.

[hentrymartin]

@hentrymartin we need to keep eye on this and avoid errors like "cannot read property 'stat' of undefined". See: 542b81e Not sure if related to promisify or fs module but we had this issue in production when released v1 security fixes.

@kkartunov Seems like the error which you quoted is not because of promisify but we forgot to add import statement for fs and thats why it was failed. With this being in mind, do we still need to remove promisify?