Project updates

[halfhp]

Mainly project maintenance stuff:

• update dependencies
• get off jcenter
• swap over from ASL to androidx

[codecov-commenter]

Codecov Report

Merging #110 (14b5b28) into master (8ad3fca) will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #110      +/-   ##
============================================
+ Coverage     69.51%   69.53%   +0.01%     
  Complexity     1199     1199              
============================================
  Files           106      106              
  Lines          4967     4973       +6     
  Branches        501      505       +4     
============================================
+ Hits           3453     3458       +5     
  Misses         1188     1188              
- Partials        326      327       +1     

Impacted Files	Coverage Δ
...dplot-core/src/main/java/com/androidplot/Plot.java	52.29% <ø> (ø)
...c/main/java/com/androidplot/pie/PieLegendItem.java	0.00% <ø> (ø)
...main/java/com/androidplot/pie/PieLegendWidget.java	30.00% <ø> (ø)
.../main/java/com/androidplot/ui/PositionMetrics.java	73.68% <ø> (ø)
...n/java/com/androidplot/ui/widget/LegendWidget.java	70.96% <ø> (ø)
...rc/main/java/com/androidplot/ui/widget/Widget.java	68.96% <ø> (ø)
...src/main/java/com/androidplot/util/FastNumber.java	87.17% <ø> (ø)
...a/com/androidplot/xy/FastLineAndPointRenderer.java	82.45% <ø> (ø)
.../com/androidplot/xy/FixedSizeEditableXYSeries.java	73.07% <ø> (ø)
...core/src/main/java/com/androidplot/xy/PanZoom.java	64.88% <ø> (ø)
... and 11 more

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