update py version in dev requirements
update py version in dev requirements

edmorley/treeherder,deathping1994/treeherder,gbrmachado/treeherder,deathping1994/treeherder,jgraham/treeherder,akhileshpillai/treeherder,vaishalitekale/treeherder,edmorley/treeherder,vaishalitekale/treeherder,gbrmachado/treeherder,sylvestre/treeherder,deathping1994/treeherder,glenn124f/treeherder,gbrmachado/treeherder,parkouss/treeherder,moijes12/treeherder,adusca/treeherder,wlach/treeherder,tojonmz/treeherder,tojon/treeherder,wlach/treeherder,wlach/treeherder,jgraham/treeherder,glenn124f/treeherder,wlach/treeherder,avih/treeherder,edmorley/treeherder,KWierso/treeherder,tojonmz/treeherder,wlach/treeherder,sylvestre/treeherder,sylvestre/treeherder,sylvestre/treeherder,wlach/treeherder,moijes12/treeherder,moijes12/treeherder,moijes12/treeherder,deathping1994/treeherder,kapy2010/treeherder,avih/treeherder,tojonmz/treeherder,jgraham/treeherder,adusca/treeherder,rail/treeherder,tojon/treeherder,glenn124f/treeherder,akhileshpillai/treeherder,deathping1994/treeherder,gbrmachado/treeherder,avih/treeherder,vaishalitekale/treeherder,jgraham/treeherder,tojon/treeherder,kapy2010/treeherder,parkouss/treeherder,akhileshpillai/treeherder,KWierso/treeherder,tojonmz/treeherder,jgraham/treeherder,rail/treeherder,rail/treeherder,moijes12/treeherder,parkouss/treeherder,KWierso/treeherder,avih/treeherder,kapy2010/treeherder,adusca/treeherder,avih/treeherder,rail/treeherder,avih/treeherder,tojon/treeherder,vaishalitekale/treeherder,tojonmz/treeherder,parkouss/treeherder,jgraham/treeherder,akhileshpillai/treeherder,kapy2010/treeherder,rail/treeherder,adusca/treeherder,akhileshpillai/treeherder,KWierso/treeherder,tojonmz/treeherder,vaishalitekale/treeherder,adusca/treeherder,adusca/treeherder,vaishalitekale/treeherder,rail/treeherder,glenn124f/treeherder,akhileshpillai/treeherder,glenn124f/treeherder,parkouss/treeherder,parkouss/treeherder,glenn124f/treeherder,edmorley/treeherder,deathping1994/treeherder,moijes12/treeherder,sylvestre/treeherder,sylvestre/treeherder,gbrmachado/treeherder,gbrmachado/treeherder,kapy2010/treeherder