Remove ruby version file (#363)
Remove ruby version file (#363)

I use direnv for this now and I don't want to force all contributors to
have the same version installed.
deivid-rodriguez/byebug,deivid-rodriguez/byebug,deivid-rodriguez/byebug,yui-knk/byebug,yui-knk/byebug,yui-knk/byebug