Bump to v2.2.0 [ci skip]
Bump to v2.2.0 [ci skip]

appsignal/appsignal-ruby,appsignal/appsignal,appsignal/appsignal-ruby,matrinox/appsignal-ruby,matrinox/appsignal-ruby,appsignal/appsignal,matrinox/appsignal-ruby,appsignal/appsignal-ruby,appsignal/appsignal-ruby