chore(deps): update dependency axe-core to v3.5.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
axe-core (source)	devDependencies	patch	3.5.3 -> 3.5.4

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Release Notes

dequelabs/axe-core

### [`v3.5.4`](https://togithub.com/dequelabs/axe-core/blob/master/CHANGELOG.md#​354-httpsgithubcomdequelabsaxe-corecomparev353v354-2020-05-22) [Compare Source](https://togithub.com/dequelabs/axe-core/compare/v3.5.3...v3.5.4)

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Codecov Report

Merging #218 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #218   +/-   ##
=======================================
  Coverage   37.80%   37.80%           
=======================================
  Files          34       34           
  Lines         283      283           
  Branches       37       37           
=======================================
  Hits          107      107           
  Misses        155      155           
  Partials       21       21           

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