Suggestion for the README.md

[dinhvh]

change:

JBBarChartView *barChartView = [[JBBarChartView alloc] init];

to

JBBarChartView *barChartView = [[JBBarChartView alloc] initWithFrame:CGRectMake(...)];

and same for JBLineChartView.

change:

return [[NSNumber numberWithFloat:NAN] floatValue];

to:

return NAN;