Update fastai dependency#49

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tyoc213 wants to merge 3 commits intofastaudio:masterfrom

tyoc213-contrib:fastai_update

Commits on Aug 27, 2020

fastai dependency update
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Update nbs fastai2 -> fastai
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Commits on Aug 28, 2020

Update tutorial to fastai and changed second example to speechs commands from pytorch audio datasets
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