faraday: Breaking changes for fastlane in 0.16.2

Basic Info

• Faraday Version: 0.16.2
• Ruby Version:
  • Windows: ruby 2.4.6p354 (2019-04-01 revision 67394) [x64-mingw32]
  • Mac: Ruby 2.5

Issue description

Even with faraday 0.16.2 and the fixes of @BobbyMcWho there are test failures for fastlane:

Failures:
  1) Spaceship::Portal::Persons should change role
     Failure/Error: expect { person.change_role("member") }.to_not(raise_error)
       expected no Exception, got #<RuntimeError: can't modify frozen String> with backtrace:
         # ./spaceship/lib/spaceship/client.rb:811:in `force_encoding'
         # ./spaceship/lib/spaceship/client.rb:811:in `log_response'
         # ./spaceship/lib/spaceship/client.rb:846:in `block in send_request'
         # ./spaceship/lib/spaceship/client.rb:620:in `with_retry'
         # ./spaceship/lib/spaceship/client.rb:844:in `send_request'
         # ./spaceship/lib/spaceship/client.rb:688:in `request'
         # ./spaceship/lib/spaceship/portal/portal_client.rb:449:in `team_set_role'
         # ./spaceship/lib/spaceship/portal/person.rb:45:in `change_role'
         # ./spaceship/spec/portal/person_spec.rb:58:in `block (3 levels) in <top (required)>'
         # ./spaceship/spec/portal/person_spec.rb:58:in `block (2 levels) in <top (required)>'
     # ./spaceship/spec/portal/person_spec.rb:58:in `block (2 levels) in <top (required)>'
  2) Spaceship::Tunes::IAPList IAPList can delete
     Failure/Error: deleted = app.in_app_purchases.find("go.find.me").delete!
     RuntimeError:
       can't modify frozen String
     # ./spaceship/lib/spaceship/client.rb:811:in `force_encoding'
     # ./spaceship/lib/spaceship/client.rb:811:in `log_response'
     # ./spaceship/lib/spaceship/client.rb:846:in `block in send_request'
     # ./spaceship/lib/spaceship/client.rb:620:in `with_retry'
     # ./spaceship/lib/spaceship/client.rb:844:in `send_request'
     # ./spaceship/lib/spaceship/client.rb:688:in `request'
     # ./spaceship/lib/spaceship/tunes/tunes_client.rb:1235:in `delete_iap!'
     # ./spaceship/lib/spaceship/tunes/iap_list.rb:72:in `delete!'
     # ./spaceship/spec/tunes/iap_list_spec.rb:28:in `block (3 levels) in <top (required)>'
  3) Spaceship::Tunes::Members members creates a new member role: admin, apps: all
     Failure/Error: Spaceship::Members.create!(firstname: "Helmut", lastname: "Januschka", email_address: "helmut@januschka.com")
     RuntimeError:
       can't modify frozen String
     # ./spaceship/lib/spaceship/client.rb:811:in `force_encoding'
     # ./spaceship/lib/spaceship/client.rb:811:in `log_response'
     # ./spaceship/lib/spaceship/client.rb:846:in `block in send_request'
     # ./spaceship/lib/spaceship/client.rb:620:in `with_retry'
     # ./spaceship/lib/spaceship/client.rb:844:in `send_request'
     # ./spaceship/lib/spaceship/client.rb:688:in `request'
     # ./spaceship/lib/spaceship/tunes/tunes_client.rb:502:in `create_member!'
     # ./spaceship/lib/spaceship/tunes/members.rb:26:in `create!'
     # ./spaceship/spec/tunes/members_spec.rb:19:in `block (4 levels) in <top (required)>'

...

PR for reference: https://github.com/fastlane/fastlane/pull/15407

Note that our tests are not failing on ruby 2.3 on macOS and Ubuntu.