⚠️ Removes the upper restriciton on Faraday

This was discussed internally, and the reasoning is as follows:

* It is known that faraday may introduce breaking changes with
  any minor, as long as they do not switch to 1.x
* We add a warning of that fact to the README file and state,
  which versions of faraday are known to work.
* If faraday introduces a breaking change, any user of cloudflair
  has to option to restrict faraday to a version known to work
  in their `Gemfile`.
* This will allow to use any newer version of faraday when it
  becomes available, but still allows to restrict the version of
  faraday to any specific version should one choose to do so, but
  it would have to be done explicitly in their own `Gemfile`.

Author: cimnine

README.md

@@ -23,6 +23,22 @@ Or install it yourself as:
 
     $ gem install cloudflair
 
+## A Note on Faraday
+
+We have decided to not tightly control the version of faraday (anymore). The versions of faraday that are known to work are listed below. If you want to update to a newer version, you're doing it at your own risk. (But if it works, which is usually when all specs pass, please send a PR to update the list below.)
+
+To be on the safe side, we recommend to lock `faraday` to any of the versions listed below. This can be done like this:
+
+```ruby
+gem 'cloudflair'
+gem 'faraday', '>=0.13', '<0.14'
+```
+
+### Faraday Versions known to work
+
+* `gem 'faraday', '>= 0.12', '<= 0.13'`
+* `gem 'faraday', '>= 0.13', '<= 0.14'` (starting with `gem 'cloudflair', '>= 0.2.0'`)
+
 ## Usage
 
 ### Configuration

cloudflair.gemspec

@@ -1,4 +1,5 @@
 # coding: utf-8
+
 lib = File.expand_path('../lib', __FILE__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require 'cloudflair/version'
@@ -19,9 +20,9 @@ Gem::Specification.new do |spec|
   spec.files         = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
   spec.bindir        = 'exe'
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
-  spec.require_paths = %w(lib)
+  spec.require_paths = %w[lib]
 
-  spec.add_runtime_dependency 'faraday', '>= 0.10.0', '< 0.14'
+  spec.add_runtime_dependency 'faraday', '>= 0.10.0'
   spec.add_runtime_dependency 'faraday_middleware'
   spec.add_runtime_dependency 'dry-configurable', '~> 0.1'
   spec.add_runtime_dependency 'faraday-detailed_logger'

lib/cloudflair/connection.rb

@@ -20,7 +20,7 @@ def self.headers
       elsif !cloudflare_auth_config.user_service_key.nil?
         headers['X-Auth-User-Service-Key'] = cloudflare_auth_config.user_service_key
       else
-        fail CloudflairError, 'Neither email & key nor user_service_key have been defined.'
+        raise CloudflairError, 'Neither email & key nor user_service_key have been defined.'
       end
       headers
     end