Update dependency mistune to v2

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mistune	==0.8.4 -> ==2.0.4

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Release Notes

lepture/mistune

v2.0.4

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v2.0.3

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v2.0.2

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Fix escape_url via https://github.com/lepture/mistune/pull/295

v2.0.1

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Fix XSS for image link syntax.

v2.0.0

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First release of Mistune v2.

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