0.14.0 - Added Bar Plot color changing feature

This release adds the functionality to change the color of the bars in a bar plot. The user can change all the bar color programmatically, or select a specific bar and change it individually. Take a look at the following example to see the new functionality.
https://github.com/jposada202020/CircuitPython_uplot/blob/main/examples/uplot_ubar_color_changing.py