[Snyk] Security upgrade showdown from 1.9.1 to 2.0.0

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	696/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 7.5	Regular Expression Denial of Service (ReDoS) SNYK-JS-ANSIREGEX-1583908	Yes	Proof of Concept

(*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: showdown

The new version differs by 21 commits.

• 32a1aaa chore(build): version 2.0.0
• 97a7696 doc(security): add a security policy
• e5f419b build: prep and create a 2.0.0-alpha release
• 366ef28 fix(extension-registering) removeExtension implementation
• 6ea6bbf Including QCObjects in "Who uses Showdown"-README (#744)
• a931cc2 docs: clear ambiguity about CDN usage
• 62636d0 feature(ellipsis): Add option to disable ellipsis
• b432da1 fix reference link impostors
• b03e34a rename test files to match convention
• 525b65f preserve spaces between inline elements
• 33f2f9c Update README.md
• b3310a1 docs: update README.md (#652)
• f54395f Escaped the <br> in README.md (#645)
• 55314da chore: add vue-showdown (#630)
• 35730b7 fix: reduce npm package size
• 25c4420 fix: allow escaping of colons
• e3ddcaf chore(license): update liscense to MIT
• 9828a82 chore(deps): make dependecies consistent with ^ operator
• 434eaff chore(deps): update all dependecies to the latest; make eslint work
• 1efca07 chore(ci): update CI to lastest node versions & github actions
• 414d7a5 remove nodejs v6 from travis CI

See the full diff

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