Bump to v0.7.0.alpha.4 [ci skip]
Bump to v0.7.0.alpha.4 [ci skip]

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