Release version 1.8.0 (#81)

* Bump version to 1.7.2 and update changelog

* Fix version

* Fix version

Merge pull request #69 from checkr/prepare-1.7.1

Release version 1.7.1

Merge pull request #62 from checkr/lucya/bump-to-1.7

Bump version to 1.7

Bump to version 1.6 (#59)

Merge pull request #50 from checkr/lucya/bump-version

Bump gem's version

Update Changelog for 1.5.2

Merge pull request #42 from checkr/veronica/add-federal-searches

Add FederalCriminalSearch and FederalCivilSearch

Merge pull request #40 from checkr/g/verifications

Add Verification

Merge pull request #38 from checkr/fix-package-return-packages

Fix packages