WebMock causes `Async::HTTP::Client#endpoint` to always be `nil`

[postmodern]

I noticed in my specs that once webmock/rspec is loaded, lib/webmock/http_lib_adapters/async_http_client_adapter.rb will detect Async::HTTP and override Async::HTTP::Client with Async::HTTP::WebMockClientWrapper which inherits from Async::HTTP::Client, *butdoes not callsuperininitializenor does it set@endpoint. Async::HTTP::Clientappears to only create it's persistent connection upon first request, so callingsuper()inAsync::HTTP::WebMockClientWrapper#initialize` should be safe.