Use IO.binread instead of IO.read (#110)

Author: smaeda-ks

lib/twurl/oauth_client.rb

@@ -99,10 +99,10 @@ def perform_request_from_options(options, &block)
           multipart_body << "\r\n"
 
           if options.upload['base64']
-            enc = Base64.encode64(File.read(filename))
+            enc = Base64.encode64(File.binread(filename))
             multipart_body << enc
           else
-            multipart_body << File.read(filename)
+            multipart_body << File.binread(filename)
           end
         }