chore(deps): update dependency axe-core to v3.5.5

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
axe-core (source)	devDependencies	patch	3.5.4 -> 3.5.5

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Release Notes

dequelabs/axe-core

### [`v3.5.5`](https://togithub.com/dequelabs/axe-core/blob/master/CHANGELOG.md#​355-httpsgithubcomdequelabsaxe-corecomparev354v355-2020-06-16) [Compare Source](https://togithub.com/dequelabs/axe-core/compare/v3.5.4...v3.5.5)

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[codecov[bot]]

Codecov Report

Merging #248 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #248   +/-   ##
=======================================
  Coverage   50.41%   50.41%           
=======================================
  Files          49       49           
  Lines         361      361           
  Branches       40       40           
=======================================
  Hits          182      182           
  Misses        149      149           
  Partials       30       30           

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