Patch for issue 2848, mostly by Humberto Diogenes, with a couple of
small fixes by Barry.  This removes mimetools from the stdlib.
diff --git a/Tools/versioncheck/pyversioncheck.py b/Tools/versioncheck/pyversioncheck.py
index b36fcce..8826555 100644
--- a/Tools/versioncheck/pyversioncheck.py
+++ b/Tools/versioncheck/pyversioncheck.py
@@ -53,7 +53,7 @@
             print('    Cannot open:', arg)
         return -1, None, None
     msg = rfc822.Message(fp, seekable=0)
-    newversion = msg.getheader('current-version')
+    newversion = msg.get('current-version')
     if not newversion:
         if verbose >= VERBOSE_EACHFILE:
             print('    No "Current-Version:" header in URL or URL not found')