py3: don't use dict.iterkeys() in hgext/fastannotate/context.py
dict.iterkeys() is not present on Python 3.
Differential Revision: https://phab.mercurial-scm.org/D4431
%include map-cmdline.default
[templates]
changeset = '{cset}{branches}{bookmarks}{tags}{lphase}{parents}{luser}{ldate}{summary}\n'
changeset_verbose = '{cset}{branches}{bookmarks}{tags}{lphase}{parents}{luser}{ldate}{lfiles}{lfile_copies_switch}{description}\n'