Make Twitter::Error#wrapped_exception interface consistent with Ruby 2.1

README.md

@@ -82,11 +82,12 @@ does not work on Ruby 2.0.0][bug].
 [tweetstream]: http://rubygems.org/gems/tweetstream
 [bug]: https://github.com/tweetstream/tweetstream/issues/117
 
-Site Streams are restricted to whitelisted accounts. To apply for access to
-Site Streams see the "Applying for access" section in the Site Streams Twitter
-API [here][twitter]. User Streams, however, are open and do not require approval.
+Site Streams are restricted to whitelisted accounts. To apply for access,
+[follow the steps in the Site Streams documentation][site-streams]. [User
+Streams][user-streams] do not require prior approval.
 
-[twitter]: https://dev.twitter.com/docs/streaming-apis/streams/site#Applying_for_access
+[site-streams]: https://dev.twitter.com/docs/streaming-apis/streams/site#Applying_for_access
+[user-streams]: https://dev.twitter.com/docs/streaming-apis/streams/user
 
 Unlike the rest of this library, this feature is not well tested and not
 recommended for production applications. That said, if you need to do Twitter

lib/twitter/error.rb

@@ -5,7 +5,8 @@ module Twitter
   # Custom error class for rescuing from all Twitter errors
   class Error < StandardError
     extend DescendantsTracker
-    attr_reader :rate_limit, :wrapped_exception, :code
+    attr_reader :cause, :code, :rate_limit
+    alias_method :wrapped_exception, :cause
 
     # If error code is missing see https://dev.twitter.com/docs/error-codes-responses
     module Codes
@@ -75,9 +76,9 @@ def extract_message_from_errors(body)
     # @param response_headers [Hash]
     # @param code [Integer]
     # @return [Twitter::Error]
-    def initialize(exception = $ERROR_INFO, response_headers = {}, code = nil) # rubocop:disable MethodLength
+    def initialize(exception = $ERROR_INFO, response_headers = {}, code = nil)
       @rate_limit = RateLimit.new(response_headers)
-      @wrapped_exception = exception
+      @cause = exception
       @code = code
       exception.respond_to?(:message) ? super(exception.message) : super(exception.to_s)
     end

lib/twitter/rest/client.rb

@@ -140,7 +140,7 @@ def request(method, path, params = {}, signature_params = params) # rubocop:disa
         end
         response.env
       rescue Faraday::Error::ClientError, JSON::ParserError => error
-        raise Twitter::Error.new(error)
+        raise Twitter::Error.new(error) # rubocop:disable RaiseArgs
       end
 
       def auth_token(method, path, params = {}, signature_params = params) # rubocop:disable ParameterLists