setup: simplekv unpin
setup: simplekv unpin

* Version 0.11.2 of simplekv restored the old behavior of accepting
  keys of type ``str`` in Python 2.

Signed-off-by: Jacopo Notarstefano <9b2cfbb82b98c608f2c886ba9b6f43b79f78200a@gmail.com>

inspirehep/invenio-accounts,tiborsimko/invenio-accounts,tiborsimko/invenio-accounts,inveniosoftware/invenio-accounts,tiborsimko/invenio-accounts,inspirehep/invenio-accounts,inspirehep/invenio-accounts,inveniosoftware/invenio-accounts,inveniosoftware/invenio-accounts