v0.7.19

NNlib v0.7.19

Diff since v0.7.18

Closed issues:

• register NNlibCUDA (#300)

Merged pull requests:

• scatter and gather support element type of idx to be CartesianIndex (#308) (@yuehhua)
• [nnlibcuda] updates for CUDA 3.0 (#311) (@CarloLucibello)
• NNlibCUDA cleanup (#312) (@CarloLucibello)
• Avoiding scalar indexing in cuda (#313) (@yuehhua)
• Move NNlibCUDA (#314) (@DhairyaLGandhi)