fix py.test version in dev requirements
fix py.test version in dev requirements

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