Make html, ipaddress, reprlib and winreg only available on Python 3 (#5502)

None of these are available in Python 2.7.

stdlib/VERSIONS

@@ -129,7 +129,7 @@ gzip: 2.7-
 hashlib: 2.7-
 heapq: 2.7-
 hmac: 2.7-
-html: 2.7-
+html: 3.0-
 http: 3.0-
 imaplib: 2.7-
 imghdr: 2.7-
@@ -138,7 +138,7 @@ importlib: 2.7-
 importlib.resources: 3.7-
 inspect: 2.7-
 io: 2.7-
-ipaddress: 2.7-
+ipaddress: 3.3-
 itertools: 2.7-
 json: 2.7-
 keyword: 2.7-
@@ -197,7 +197,7 @@ quopri: 2.7-
 random: 2.7-
 re: 2.7-
 readline: 2.7-
-reprlib: 2.7-
+reprlib: 3.0-
 resource: 2.7-
 rlcompleter: 2.7-
 runpy: 2.7-
@@ -264,7 +264,7 @@ warnings: 2.7-
 wave: 2.7-
 weakref: 2.7-
 webbrowser: 2.7-
-winreg: 2.7-
+winreg: 3.0-
 winsound: 2.7-
 wsgiref: 2.7-
 xdrlib: 2.7-