Inconsistent documentation for config validation

[crondaemon]

Describe the bug
The documentation states

assert SidekiqUniqueJobs.validate_worker!(BadWorker.get_sidekiq_options)

in the minitest section. Hoever, the code is

raise InvalidWorker, lock_config unless lock_config.errors.empty?

this would require assert_nothing_raised or similar to be used.

Expected behavior
A failing test should gently say the test is not passed.

Current behavior
The test crashes.

[mhenrixon]

PRs greatly appreciated. I don't use test unit and friends