Update What's New doc page with info about v0.12.2
Update What's New doc page with info about v0.12.2

PythonCharmers/python-future,QuLogic/python-future,michaelpacer/python-future,PythonCharmers/python-future,michaelpacer/python-future,krischer/python-future,QuLogic/python-future,krischer/python-future