fix(travis): reqs.pip -> reqs.txt
fix(travis): reqs.pip -> reqs.txt

letolab/HTTPretty,paylogic/HTTPretty,pxg/HTTPretty,letolab/HTTPretty,codepython/HTTPretty,andresriancho/HTTPretty,codepython/HTTPretty,xgess/HTTPretty,gabrielfalcao/HTTPretty,gabrielfalcao/HTTPretty,demianbrecht/HTTPretty,codepython/HTTPretty,paylogic/HTTPretty,Multiposting/HTTPretty,demianbrecht/HTTPretty,BenjamenMeyer/HTTPretty,Multiposting/HTTPretty,andresriancho/HTTPretty,xgess/HTTPretty,andresriancho/HTTPretty,pxg/HTTPretty,paylogic/HTTPretty,pxg/HTTPretty,demianbrecht/HTTPretty,BenjamenMeyer/HTTPretty,andresriancho/HTTPretty,letolab/HTTPretty,BenjamenMeyer/HTTPretty,Multiposting/HTTPretty,xgess/HTTPretty