Use require_relative' instead of require`

Author: bblimke

lib/webmock/http_lib_adapters/http_rb_adapter.rb

@@ -31,9 +31,9 @@ def enabled?
     end
   end
 
-  require "webmock/http_lib_adapters/http_rb/client"
-  require "webmock/http_lib_adapters/http_rb/request"
-  require "webmock/http_lib_adapters/http_rb/response"
-  require "webmock/http_lib_adapters/http_rb/streamer"
-  require "webmock/http_lib_adapters/http_rb/webmock"
+  require_relative "http_rb/client"
+  require_relative "http_rb/request"
+  require_relative "http_rb/response"
+  require_relative "http_rb/streamer"
+  require_relative "http_rb/webmock"
 end