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Fix no such module 'DOT' by pinning GraphViz 0.2.0 (#1067)

* Revert "Fix no such module 'DOT' (#1065)"

This reverts commit 69a1cd56b5a3c24cafac9996647f12630a483b3c.

* pin GraphViz v0.2.0

* update CHANGELOG
Y
Yasuharu Yanamura committed
1df0bb3e7b65bd01cef457399d53bf5050c2b46c
Parent: 69a1cd5
Committed by GitHub <noreply@github.com> on 5/4/2021, 10:45:42 PM