v0.7.20

NNlib v0.7.20

Diff since v0.7.19

Closed issues:

• add rrules for max/min scatter (#317)

Merged pull requests:

• Add rrule for scatter (#297) (@yuehhua)
• introduce trilinear upsampling (#315) (@maxfreu)
• Add NNlibCUDA to test deps (#316) (@DhairyaLGandhi)
• Add gradient for gather (#318) (@yuehhua)
• scatter cleanup and fix min/max (#319) (@CarloLucibello)