Fix Dockerfile#49

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ndahlquist wants to merge 3 commits intopanrafal:masterfrom

Commits on Jul 29, 2020

Fix dockerfile.
ndahlquist
committed
Add dataURL webp as frame, not canvas, use whammy compile callback (#2)

v-suprun
authored and
ndahlquist
committed
Update readme.
ndahlquist
committed