chore: bumps version to v2.2.1

Author: DevinCodes

CHANGELOG.MD

@@ -1,6 +1,15 @@
 # CHANGELOG
 
-## [Unreleased](https://github.com/algolia/algoliasearch-rails/compare/2.1.4...master)
+## [Unreleased](https://github.com/algolia/algoliasearch-rails/compare/2.2.1...master)
+
+## [2.2.1](https://github.com/algolia/algoliasearch-rails/compare/2.2.0...2.2.1)
+### Fixed
+* fix:settings changes detection issue with empty array [`#424`](https://github.com/algolia/algoliasearch-rails/pull/424)
+* fix: settings changes detection issue for replica indexes with inherit option [`#426`](https://github.com/algolia/algoliasearch-rails/pull/426)
+* fix: make sync opt to be selectable for auto setting update logic [`#425`](https://github.com/algolia/algoliasearch-rails/pull/425)
+
+### Added
+* Add relevancyStrictness to IndexSettings [`#427`](https://github.com/algolia/algoliasearch-rails/pull/427)
 
 ## [2.2.0](https://github.com/algolia/algoliasearch-rails/compare/2.1.4...2.2.0)
 ### Added

lib/algoliasearch/version.rb

@@ -1,3 +1,3 @@
 module AlgoliaSearch
-  VERSION = '2.2.0'
+  VERSION = '2.2.1'
 end