add changelog 3.8 (merge pull requests+branches)
add changelog 3.8 (merge pull requests+branches)

valdur55/py3status,Andrwe/py3status,Andrwe/py3status,guiniol/py3status,tobes/py3status,valdur55/py3status,ultrabug/py3status,guiniol/py3status,ultrabug/py3status,ultrabug/py3status,tobes/py3status,valdur55/py3status