Update dependency gatsby to v2.16.2

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
gatsby	dependencies	patch	2.16.1 -> 2.16.2

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Release Notes

gatsbyjs/gatsby

### [`v2.16.2`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.16.1...gatsby@2.16.2) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.16.1...gatsby@2.16.2)

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[codecov[bot]]

Codecov Report

Merging #316 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #316   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5      5           
  Lines          60     60           
  Branches       10     10           
=====================================
  Hits           60     60

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