bumped faraday to latest version and included adapters for testing

ipinfo.gemspec

@@ -16,7 +16,17 @@ Gem::Specification.new do |spec|
     spec.description   = ' This is a ruby wrapper for http://ipinfo.io. '
     spec.homepage      = 'https://ipinfo.io'
 
-    spec.add_runtime_dependency 'faraday', '~> 1.0'
+    spec.add_runtime_dependency 'faraday', '~> 2.0'
+    # add development dependency to test against faraday adapters that are been moved out the gem
+    spec.add_development_dependency 'async-http-faraday'
+    spec.add_development_dependency 'faraday-net_http_persistent', '~> 2.0'
+    spec.add_development_dependency 'faraday-typhoeus', '~> 1.0'
+    spec.add_development_dependency 'faraday-patron', '~> 2.0'
+    spec.add_development_dependency 'faraday-httpclient', '~> 2.0'
+    spec.add_development_dependency 'faraday-excon', '~> 2.1'
+    # spec.add_development_dependency 'faraday-em_http', '~> 1.0'
+    # spec.add_development_dependency 'faraday-em_synchrony', '~> 1.0'
+
     spec.add_runtime_dependency 'json', '~> 2.1'
     spec.add_runtime_dependency 'lru_redux', '~> 1.1'
     spec.add_development_dependency 'byebug'

lib/ipinfo/adapter.rb

@@ -35,8 +35,8 @@ def post(uri, body, timeout = 2)
     attr_reader :token
 
     def connection(adapter)
-        Faraday.new(url: "https://#{HOST}") do |conn|
-            conn.adapter(adapter)
+        Faraday.new(url: "https://#{HOST}") do |f|
+            f.adapter(adapter)
         end
     end
 

test/lib/adapter_test.rb

@@ -3,6 +3,17 @@
 require 'test_helper'
 require_relative '../../lib/ipinfo/adapter'
 
+require 'faraday/net_http_persistent'
+require 'faraday/typhoeus'
+require 'faraday/patron'
+require 'faraday/httpclient'
+require 'faraday/excon'
+
+# No updates since 2021, the method `dependecy` from the class Faraday::Adapter has been removed
+# https://github.com/lostisland/faraday/blob/main/UPGRADING.md#the-dependency-method-in-middlewares-has-been-removed
+# require 'faraday/em_http'
+# require 'faraday/em_synchrony'
+
 class IPinfo::AdapterTest < Minitest::Test
     def test_default
         adapter = IPinfo::Adapter.new
@@ -17,8 +28,8 @@ def test_default
         net_http_persistent: Faraday::Adapter::NetHttpPersistent,
         typhoeus: Faraday::Adapter::Typhoeus,
         patron: Faraday::Adapter::Patron,
-        em_synchrony: Faraday::Adapter::EMSynchrony,
-        em_http: Faraday::Adapter::EMHttp,
+        # em_synchrony: Faraday::Adapter::EMSynchrony,
+        # em_http: Faraday::Adapter::EMHttp,
         excon: Faraday::Adapter::Excon,
         httpclient: Faraday::Adapter::HTTPClient
     }.freeze