fix(faraday): do not depend on Faraday >= 2.x as it breaks diplomat

Fix #223

Author: Pierre Souchay

diplomat.gemspec

@@ -25,5 +25,8 @@ Gem::Specification.new 'diplomat', Diplomat::VERSION do |spec|
   spec.add_development_dependency 'webmock'
 
   spec.add_runtime_dependency 'deep_merge', '~> 1.2'
-  spec.add_runtime_dependency 'faraday', '>= 0.9'
+
+  # See https://github.com/WeAreFarmGeek/diplomat/issues/223
+  # For now, diplomat does not work with faraday 2.x
+  spec.add_runtime_dependency 'faraday', '>= 0.9', '< 2.0'
 end