Chart [min, max] does not optimise for values

Expected Behaviour

Chart min and max values should optimise for data values. This was also initially reported in https://github.com/frappe/charts/issues/57 and fixed after that.

Actual Behaviour

There is a bunch of space above and below the line (see image)

Steps to Reproduce:

Data values are from 13.45 to 14.52 Code is here: http://jsbin.com/wodujuk/1/edit?js,output

Frappé Charts version: https://unpkg.com/frappe-charts@0.0.8/dist/frappe-charts.min.iife.js