chore(deps-dev): bump markdown-it-container from 2.0.0 to 3.0.0

[dependabot[bot]]

Bumps markdown-it-container from 2.0.0 to 3.0.0.

Changelog

Sourced from markdown-it-container's changelog.

3.0.0 / 2020-06-02

• Don't assume there are no classes, #26.
• Added bordering markup to validator params.
• Fix tests to work with latest markdown-it.
• Dev deps bump.
• Reorganize configs.

Commits

• adb3def 3.0.0 released
• 58bc8d7 Browser files rebuild
• f27f757 Add bordering markup to validator params
• c90de0a uglify-js => terser
• d59c18a istanbul => nyc
• d67e789 Dev deps bump + related CS changes
• 539ef20 Remove outdated test
• 8179fef deps/configs update
• 13e0fc5 Merge pull request #26 from dinamomx/master
• 1749b2b Don't assume there are no classes
• Additional commits viewable in compare view

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