Fix TypeError on "setup.py upload --show-response".

Lib/distutils/config.py

@@ -3,6 +3,7 @@
 Provides the PyPIRCCommand class, the base class for the command classes
 that uses .pypirc in the distutils.command package.
 """
+import cgi
 import os
 from configparser import ConfigParser
 
@@ -101,6 +102,12 @@ class PyPIRCCommand(Command):
 
         return {}
 
+    def _read_pypi_response(self, response):
+        """Read and decode a PyPI HTTP response."""
+        content_type = response.getheader('content-type', 'text/plain')
+        encoding = cgi.parse_header(content_type)[1].get('charset', 'ascii')
+        return response.read().decode(encoding)
+
     def initialize_options(self):
         """Initialize options."""
         self.repository = None