uitest script is not available in package.json, but it's mentioned in tests.md

[kumarrishav]

• Did you search for similar issues before submitting this one?
  Yes

• Describe the issue you encountered:
  https://github.com/brave/browser-laptop/blob/master/docs/tests.md say, to run uitest, use : npm run uitest but there is no script available regarding uitest in package.json

• Platform (Win7, 8, 10? macOS? Linux distro?):
  macOS (probably All)

• Brave Version (revision SHA):
  Brave 0.15.0 (revision d1fc13c)

• Steps to reproduce:

  1. execute npm run uitest

• Actual result:

• Expected result:

• Will the steps above reproduce in a fresh profile? If not what other info can be added?

• Is this an issue in the currently released version?

• Can this issue be consistently reproduced?

• Extra QA steps:
  1.
  2.
  3.

• Screenshot if needed:

• Any related issues:

[luixxiul]

@kumarrishav nice find :-)