Added @ArielDemarco as a maintainer (#884)

Author: ArielDemarco

CODEOWNERS

@@ -12,9 +12,9 @@
 #  https://help.github.com/en/articles/about-code-owners
 #
 
-# Maintainers: @nachoBonafonte @bryce-b
+# Maintainers: @nachoBonafonte @bryce-b @ArielDemarco
 
-# Approvers: @vvydier @ArielDemarco
+# Approvers: @vvydier
 
 
 * @nachoBonafonte @bryce-b @vvydier @ArielDemarco

README.md

@@ -121,14 +121,14 @@ We are also available in the [#otel-swift](https://cloud-native.slack.com/archiv
 
 ### Maintainers
 
+- [Ariel Demarco](https://github.com/arieldemarco), Embrace
 - [Bryce Buchanan](https://github.com/bryce-b), Elastic
 - [Ignacio Bonafonte](https://github.com/nachobonafonte), Independent
 
 For more information about the maintainer role, see the [community repository](https://github.com/open-telemetry/community/blob/main/guides/contributor/membership.md#maintainer).
 
 ### Approvers
 
-- [Ariel Demarco](https://github.com/arieldemarco), Embrace
 - [Austin Emmons](https://github.com/atreat), Embrace
 - [Vinod Vydier](https://github.com/vvydier), Independent