bpo-33336, imaplib: Legalize MOVE command (GH-6569)

imaplib now allows MOVE command in IMAP4.uid() (RFC 6851:
IMAP MOVE Extension) and potentially as a name of supported
method of IMAP4 object.
(cherry picked from commit caa331d4)
Co-authored-by: Matěj Cepl <mcepl@cepl.eu>

Lib/imaplib.py

@@ -70,6 +70,7 @@ Commands = {
         'LOGIN':        ('NONAUTH',),
         'LOGOUT':       ('NONAUTH', 'AUTH', 'SELECTED', 'LOGOUT'),
         'LSUB':         ('AUTH', 'SELECTED'),
+        'MOVE':         ('SELECTED',),
         'NAMESPACE':    ('AUTH', 'SELECTED'),
         'NOOP':         ('NONAUTH', 'AUTH', 'SELECTED', 'LOGOUT'),
         'PARTIAL':      ('SELECTED',),                                  # NB: obsolete

Misc/NEWS.d/next/Library/2018-04-27-22-18-38.bpo-33336.T8rxn0.rst

+``imaplib`` now allows ``MOVE`` command in ``IMAP4.uid()`` (RFC 
+6851: IMAP MOVE Extension) and potentially as a name of supported 
+method of ``IMAP4`` object.