Use external em_http and em_synchrony adapters

faraday.gemspec

@@ -15,6 +15,8 @@ Gem::Specification.new do |spec|
 
   spec.required_ruby_version = '>= 2.4'
 
+  spec.add_dependency 'faraday-em_http', '~> 1.0'
+  spec.add_dependency 'faraday-em_synchrony', '~> 1.0'
   spec.add_dependency 'faraday-excon', '~> 1.1'
   spec.add_dependency 'faraday-net_http', '~> 1.0'
   spec.add_dependency 'faraday-net_http_persistent', '~> 1.1'

lib/faraday.rb

@@ -27,9 +27,11 @@
 require 'faraday/file_part'
 require 'faraday/param_part'
 
+require 'faraday/em_http'
+require 'faraday/em_synchrony'
+require 'faraday/excon'
 require 'faraday/net_http'
 require 'faraday/net_http_persistent'
-require 'faraday/excon'
 
 # This is the main namespace for Faraday.
 #

lib/faraday/adapter.rb

@@ -13,8 +13,6 @@ class Adapter
                         test: [:Test, 'test'],
                         typhoeus: [:Typhoeus, 'typhoeus'],
                         patron: [:Patron, 'patron'],
-                        em_synchrony: [:EMSynchrony, 'em_synchrony'],
-                        em_http: [:EMHttp, 'em_http'],
                         rack: [:Rack, 'rack'],
                         httpclient: [:HTTPClient, 'httpclient']