Bump to v0.5.0.beta3 [ci skip]
Bump to v0.5.0.beta3 [ci skip]

subvisual/appsignal,stijnster/appsignal-ruby,matrinox/appsignal-ruby,appsignal/appsignal-ruby,stijnster/appsignal-ruby,appsignal/appsignal,appsignal/appsignal-ruby,appsignal/appsignal-ruby,q-m/appsignal,codefarmdev/haystack,stijnster/appsignal-ruby,matrinox/appsignal-ruby,matrinox/appsignal-ruby,rranelli/appsignal,appsignal/appsignal-ruby,appsignal/appsignal