allow regex for sensitive values

[jduepmeier]

I want to test a sensitive value with a regex pattern:

is_expected.to contain_file('/namevar').with({
  content: sensitive(%r{.+-blubb-.+}}),
})

Is it possible to allow this?

[franknarf8]

I think it works; just tested it :

rspec-puppet/CHANGELOG.md

Line 9 in c4ceecd

* Added support for regexp arguments to Sensitive

rspec-puppet/CHANGELOG.md

Lines 15 to 28 in c4ceecd

	### Breaking Changes
	* As of the 2.8.0 release, the `rspec-puppet` project no longer guarantees compatibility
	with Puppet 2.x or 3.x (running under Ruby 1.8.7) or Puppet 4.x (running under Ruby 1.9.3).
	* This release adds support for the [`Sensitive`](https://puppet.com/docs/puppet/latest/lang_data_sensitive.html)
	data type, however existing tests that were expecting `String` content may need to be updated
	to wrap the expected value in the new `sensitive` helper:
	```ruby
	# Old
	it { is_expected.to contain_file('/etc/mysecret.conf').with_content("top secret\n") }
	# New
	it { is_expected.to contain_file('/etc/mysecret.conf').with_content(sensitive("top secret\n")) }
	```