Make Version/Last-Modified optional/deprecated.

These fields were maintained by the version control system, and this
no longer happens with git.  They are already no longer displayed in
the published versions of the pages.

pep-0001.txt

@@ -1,7 +1,5 @@
 PEP: 1
 Title: PEP Purpose and Guidelines
-Version: $Revision$
-Last-Modified: $Date$
 Author: Barry Warsaw, Jeremy Hylton, David Goodger, Nick Coghlan
 Status: Active
 Type: Process
@@ -370,8 +368,6 @@ optional and are described below.  All other headers are required. ::
 
     PEP: <pep number>
     Title: <pep title>
-    Version: <version string>
-    Last-Modified: <date string>
     Author: <list of authors' real names and optionally, email addrs>
   * BDFL-Delegate: <PEP czar's real name>
   * Discussions-To: <email address>

pep0/pep.py

@@ -156,8 +156,8 @@ class PEP(object):
     # The various RFC 822 headers that are supported.
     # The second item in the nested tuples represents if the header is
     # required or not.
-    headers = (('PEP', True), ('Title', True), ('Version', True),
-               ('Last-Modified', True), ('Author', True),
+    headers = (('PEP', True), ('Title', True), ('Version', False),
+               ('Last-Modified', False), ('Author', True),
                ('BDFL-Delegate', False),
                ('Discussions-To', False), ('Status', True), ('Type', True),
                ('Content-Type', False), ('Requires', False),