iOS / PNChart

Fix iOS version requirements in README

...to avoid confusion for people trusting the README.

Piechart labels filter based on values

I added this property because showing all labels, when there are a lot of small items in the dataset, is quite confusing.

Example:
piechart.labelPercentageCutoff = 0.05
hide all labels with value less than 5% (I use this most of the times).

Leii

Merge from origin

Add prefix/suffix public property for y label values

Make countingLabel show updated percent instead of absolute value

A radar chart is a graphical method of displaying multivariate data in
the form of a two-dimensional chart of three or more quantitative
variables represented on axes starting from the same point.

Too ugly that I can not stand with.

Add the new feature that supports show the negative numbers

Line chart ylabel formatter block

Optimize Negative show

Klauslanza line chart ylabel formatter

Update

optimize gradient show