replace pip freeze with pip list in .travis.yml
replace pip freeze with pip list in .travis.yml

raycarnes/erppeek,NeovaHealth/erppeek,josuebrunel/erppeek,yvaucher/erppeek,factorlibre/erppeek,CLVsol/erppeek,Endika/erppeek,yvaucher/erppeek