[Snyk] Upgrade shelljs from 0.8.3 to 0.8.3

[snyk-bot]

Snyk has created this PR to upgrade shelljs from 0.8.3 to 0.8.3.

• The recommended version is 0 versions ahead of your current version.
• The recommended version was released a year ago, on 2018-11-13.

Release notes

• Package name: shelljs
  • 0.8.3 - 2018-11-13

    Closed issues:

    • Shelljs print stderr to console even if exec-only "silent" is true #905
    • refactor: remove common.state.tempDir #902
    • Can't suppress stdout for echo #899
    • exec() doesn't apply the arguments correctly #895
    • shell.exec('npm pack') painfully slow #885
    • shelljs.exec cannot find app.asar/node_modules/shelljs/src/exec-child.js #881
    • test infra: mocks and skipOnWin conflict #862
    • Support for shell function completion on IDE #859
    • echo command shows options in stdout #855
    • silent does not always work #851
    • Appveyor installs the latest npm, instead of the latest compatible npm #844
    • Force symbolic link (ln -sf) does not overwrite/recreate existing destination #830
    • inconsistent result when trying to echo to a file #798
    • Prevent require()ing executable-only files #789
    • Cannot set property to of [object String] which has only a getter #752
    • which() should check executability before returning a value #657
    • Bad encoding experience #456
    • phpcs very slow #440
    • Error shown when triggering a sigint during shelljs.exec if process.on sigint is defined #254
    • .to\(file\) does not mute STDIO output #146
    • Escaping shell arguments to exec() #143
    • Allow multiple string arguments for exec() #103
    • cp does not recursively copy from readonly location #98
    • Handling permissions errors on file I/O #64

    Merged pull requests:

    • Add test case for sed on empty file #904 (wyardley)
    • refactor: don't expose tempdir in common.state #903 (nfischer)
    • chore(ci): fix codecov on travis #897 (nfischer)
    • chore(npm): add ci-or-install script #896 (nfischer)
    • Fix silent exec #892 (nfischer)
    • chore(appveyor): run entire test matrix #886 (nfischer)
    • docs: remove gitter badge #880 (nfischer)
    • grep includes the i flag #876 (ppsleep)
    • Fix(which): match only executable files (#657) #874 (termosa)
    • chore: rename some tests #871 (nfischer)
    • Fix cp from readonly source #870 (nfischer)
    • chore: bump dev dependencies and add package-lock #864 (nfischer)
    • fix(mocks): fix conflict between mocks and skip #863 (nfischer)
    • chore: output npm version in travis #850 (nfischer)
    • Prevent require-ing bin/shjs #848 (freitagbr)
    • chore(appveyor): do not use latest npm #847 (nfischer)
    • chore: update shelljs-release version #846 (nfischer)
from [`shelljs` GitHub Release Notes](https://github.com/shelljs/shelljs/releases)

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