[Snyk] Security upgrade newman from 3.10.0 to 4.4.0

[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

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	748/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 7.1	Improper Privilege Management SNYK-JS-SHELLJS-2332187	Yes	Proof of Concept

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

Commit messages

Package name: newman

The new version differs by 250 commits.

• 16c6b26 Merge branch 'release/4.4.0'
• 32154bf Released v4.4.0
• 8644dd8 Merge pull request #1909 from postmanlabs/feature/disabled-variables
• 2dffb59 Test: update disabled variable collection
• 5bad9f7 Added tests for disabled variables
• f2e6dba Merge pull request #1897 from postmanlabs/greenkeeper/xmlbuilder-11.0.0
• 673a479 Fix JUnit reporter assertions
• f15703d Merge branch 'develop' of github.com:postmanlabs/newman into greenkeeper/xmlbuilder-11.0.0
• 1d47aa2 Merge pull request #1903 from postmanlabs/feature/timings
• 5297613 Point postman-runtime and postman-collection dependency to `v7.9.1`
• 7e24f45 Point postman-runtime and postman-collection dependency to `latest`
• a0edae8 Test: add missing system headers
• b716cf3 Merge branch 'develop'
• 7ed8b59 Merge pull request #1874 from postmanlabs/feature/bomb
• 6dd20f9 Handle cache for missing phases
• 335b209 Spruced up copy in README.md
• 91b992f Minor: add JSDoc for util.detectEncoding
• 9c0f1e9 Merge branch 'develop'
• 2d7ee42 Add additional timing phases
• 55b84d0 Temp: Point postman-collection and postman-runtime to `develop`
• 90f32f2 Merge pull request #1901 from postmanlabs/greenkeeper/mocha-6.0.0
• 7e61956 Merge branch 'develop' into greenkeeper/mocha-6.0.0
• 8826563 Merge pull request #1900 from postmanlabs/greenkeeper/eslint-5.14.1
• d7e6b31 chore(package): update lockfile package-lock.json

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