Logging is standardized and replaced by print messages. The standardized verbose setting are: `60 or 'silent' , 40 or 'error', 30 or 'warning' , 20 or 'info', 10 or 'debug'`
1.1.14
* add gradient_on_density_color to init * update docstrings
1.1.13
* fix for transparency when using scheme=hex
1.1.12
* Set transparency based on density of the data * Update docstrings with examples
1.1.11
* New function to check whether it is hex color: `is_hex_color`
1.1.10
* Fix in case `matplotlib.colormaps` does not exist.