Bump version to 2.2.0

Author: mmacai

CHANGELOG.md

@@ -7,6 +7,18 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+<!-- ### Added -->
+
+<!-- ### Changed -->
+
+<!-- ### Deprecated -->
+
+<!-- ### Removed -->
+
+<!-- ### Security -->
+
+## [2.2.0] - 2019-06-17
+
 ### Added
 
 - [API Gateway] New custom metric: `rig_proxy_requests_total`. For details see [`metrics-details.md`](docs/metrics-details.md). [#157](https://github.com/Accenture/reactive-interaction-gateway/issues/157)
@@ -68,10 +80,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   }
   ```
 
-<!-- ### Removed -->
-
-<!-- ### Security -->
-
 ## [2.1.1] - 2019-03-27
 
 ### Added

version

@@ -1,4 +1,4 @@
 %{
-  rig: "2.1.1",
+  rig: "2.2.0",
   elixir: "~> 1.7",
 }