Update dependencies and add support for WebP TAR#122

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ElizabethHudnott wants to merge 9 commits intospite:masterfrom

ElizabethHudnott:master

Commits on Aug 10, 2020

Update webm-writer to 0.3.0
ElizabethHudnott
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Commits on Aug 11, 2020

Commits on Aug 12, 2020

Commits on Nov 23, 2020