remotenames: don't inherit the remotenames class from dict class
The remotenames class was moved from hgremotenames extension. The class in
hgremotenames extension used to extend dict because updating bookmark was done
through a dict-like interface or Sean (smf) wanted it to be that way.
But now, we can remove the inheritance from the dict class as updating bookmark
is not done using a dict-like interface.
Thanks to Martin von Zweigbergk for spotting this.
Differential Revision: https://phab.mercurial-scm.org/D2361
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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