[Snyk] Security upgrade shelljs from 0.7.8 to 0.8.5

[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	No	Proof of Concept

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

Commit messages

Package name: shelljs

The new version differs by 71 commits.

• 70668a4 0.8.5
• d919d22 fix(exec): lockdown file permissions (#1060)
• fcf1651 0.8.4
• a1111ee Silence potentially upcoming circular dependency warning (#973)
• d4d1317 0.8.3
• db317bf Add test case for sed on empty file (#904)
• 0d5ecb6 docs(changelog): updated by Nate Fischer [ci skip]
• 6b3c7b1 refactor: don't expose tempdir in common.state (#903)
• 4bd22e7 chore(ci): fix codecov on travis (#897)
• 2b3b781 fix: silent exec (#892)
• 37acb86 chore(npm): add ci-or-install script (#896)
• 4e861db chore(appveyor): run entire test matrix (#886)
• d079515 docs: remove gitter badge (#880)
• 4113a72 grep includes the i flag (#876)
• 8dae55f Fix(which): match only executable files (#874)
• 6d66a1a chore: rename some tests (#871)
• 131b88f Fix cp from readonly source (#870)
• 1dd437e fix(mocks): fix conflict between mocks and skip (#863)
• 72ff790 chore: bump dev dependencies and add package-lock (#864)
• 93bbf68 Prevent require-ing bin/shjs (#848)
• aa9d443 chore: output npm version in travis (#850)
• 4733a32 chore(appveyor): do not use latest npm (#847)
• dd5551d chore: update shelljs-release version (#846)
• 97a4df8 docs(changelog): updated by Nate Fischer [ci skip]

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