[Snyk] Security upgrade grunt-contrib-uglify from 2.3.0 to 3.4.0

[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
  • package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Denial of Service (DoS) SNYK-JS-TRIMNEWLINES-1298042	Yes	No Known Exploit

Commit messages

Package name: grunt-contrib-uglify

The new version differs by 16 commits.

• 7b4ecb5 v3.4.0.
• f6f834b v3.4.0.
• e7915ce v3.3.0.
• bf23f0b Lock grunt-contrib-internal to v1.3.0.
• 6db68bd upgrade to uglify-js 3.3.0
• 04494d9 Update docs/uglify-options.md.
• 263196c Add a Git .mailmap with my new name (#497)
• 3105f8d v3.2.1.
• 602ced4 Update uglify-js to v3.2.0
• 5251b6f decouple `sourceMapIn` from `sourceMap.url`
• 2edfe0b Update uglify-js to v3.1.0.
• 2773e7e v3.0.1.
• 85a1ac3 fix typo
• 755360b Move `require()` up
• 0f45e4e v3.0.0.
• ccd7ad0 Upgrade to uglify-js 3.0.4. (#472)

See the full diff

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