update versions in docs

Author: mitchellhenke

README.md

@@ -17,7 +17,7 @@ defp application do
 end
 
 defp deps do
-  [{:sentry, "~> 2.1.0"}]
+  [{:sentry, "~> 2.2.0"}]
 end
 ```
 

docs/index.rst

@@ -24,7 +24,7 @@ Edit your mix.exs file to add it as a dependency and add the ``:sentry`` package
   end
 
   defp deps do
-    [{:sentry, "~> 2.1.0"}]
+    [{:sentry, "~> 2.2.0"}]
   end
 
 Configuration