docs: Add undefined input behaviour to README (#16)
docs: Add undefined input behaviour to README (#16)

jleft/d3-financial-components,chrisprice/d3fc,ColinEberhardt/d3fc,ColinEberhardt/d3fc,d3fc/d3fc,ColinEberhardt/d3fc,d3fc/d3fc,ScottLogic/d3fc,chrisprice/d3fc,ScottLogic/d3fc,ScottLogic/d3fc,jleft/d3-financial-components,d3fc/d3fc,d3fc/d3fc,chrisprice/d3fc,jleft/d3-financial-components