Fixes call to unexported function
Fixes call to unexported function

src/github.com/RangelReale/osin/util.go:58: cannot refer to unexported name strings.toLower
src/github.com/RangelReale/osin/util.go:58: undefined: strings.toLower

agtorre/osin,liggitt/osin,go-osin/osin,RangelReale/osin,Iceyer/osin