[Snyk] Upgrade core-js from 3.3.6 to 3.4.0

[snyk-bot]

Snyk has created this PR to upgrade core-js from 3.3.6 to 3.4.0.

ℹ️ Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 1 version ahead of your current version.
• The recommended version was released 8 days ago, on 2019-11-06.

Release notes

• Package name: core-js
  • 3.4.0 - 2019-11-06
    • Added well-formed JSON.stringify, ES2019 feature, thanks @ExE-Boss and @WebReflection for the idea
    • Fixed Math.signbit, #687, thanks @chicoxyzzy
  • 3.3.6 - 2019-10-31
    • Don't detect Chakra-based Edge as Chrome in the userAgent parsing
    • Fixed inheritance in typed array constructors wrappers, #683
    • Added one more workaround for correct work of early fetch implementations with polyfilled URLSearchParams, #680
from core-js GitHub release notes

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[codecov]

Codecov Report

Merging #118 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #118   +/-   ##
=======================================
  Coverage   48.51%   48.51%           
=======================================
  Files          38       38           
  Lines         439      439           
  Branches       11       11           
=======================================
  Hits          213      213           
  Misses        225      225           
  Partials        1        1

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