Version bump to 0.17.6

lib/faraday.rb

@@ -14,7 +14,7 @@ require 'forwardable'
 #   conn.get '/'
 #
 module Faraday
-  VERSION = "0.17.5"
+  VERSION = "0.17.6"
 
   class << self
     # Public: Gets or sets the root path that Faraday is being loaded from.

lib/faraday/upload_io.rb

@@ -1,10 +1,15 @@
 begin
+  require 'multipart/post'
+  require 'stringio'
+rescue LoadError
+  begin
     require 'composite_io'
     require 'parts'
     require 'stringio'
-rescue LoadError
+  rescue LoadError
     $stderr.puts "Install the multipart-post gem."
     raise
+  end
 end
 
 module Faraday
@@ -62,6 +67,11 @@ module Faraday
     end
   end
 
+  if defined?(::Multipart::Post::UploadIO)
+    UploadIO = ::Multipart::Post::UploadIO
+    Parts = ::Multipart::Post::Parts
+  else
     UploadIO = ::UploadIO
     Parts = ::Parts
+  end
 end