Release v1.2.0

• Update target platform to latest version
• Move from Android support libraries to AndroidX
• Allow the scale used for the maximum drawing size to be set directly instead of through the max width/height
• Pass the point to the marker callback so that point specific information can be used to draw the marker

Release v1.1

Changes

• Render the HeatMap in a worker thread (#3 by @Valodim)
• Improvements to memory usage through a configurable maximum size on the rendering surface
• Allow markers to be drawn at data points via a callback

Release v1.0

Removed tests.