Preserving a predictable output

Hey :)
Using this gem we noticed that having predictable data in different run can be useful if you are going to regenerate the OpenAPI documentation (fully or partially).

To achieve this goal we are using this configuration block:

```rb
if ENV['OPENAPI'].present?
seed = ENV.fetch('OPENAPI_SEED', 0xFFFF)
srand(seed)
Faker::Config.random = Random.new(seed) if defined? Faker

RSpec.configure do |config|
config.order = :defined

config.before do
allow(Devise).to receive(:friendly_token) { ('A'..'Z').to_a.sample(20).join } if defined? Devise

ActiveRecord::Base.connection.tables.each do |t|
# to preserve IDs
ActiveRecord::Base.connection.reset_pk_sequence!(t)
end
end

config.include ActiveSupport::Testing::TimeHelpers

config.around do |example|
time = Time.zone.local(2022, 10, 15, 12, 34, 56)
travel_to(time) # to preserve dates & times
example.run
travel_back
end
end
end
```

Perhaps these kind of options shouldn't be included in the gem (they are _configuration_) but they could be useful in the README to help others.

WDYT?