chore(deps-dev): bump chai from 4.0.2 to 4.2.0

Bumps [chai](https://github.com/chaijs/chai) from 4.0.2 to 4.2.0.
- [Release notes](https://github.com/chaijs/chai/releases)
- [Changelog](https://github.com/chaijs/chai/blob/master/History.md)
- [Commits](chaijs/chai@4.0.2...4.2.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -43,7 +43,7 @@
     "babel-plugin-transform-remove-strict-mode": "~0.0.2",
     "babel-preset-gatsby": "^0.2.20",
     "body-parser": "^1.18.2",
-    "chai": "~4.0.1",
+    "chai": "~4.2.0",
     "commander": "~2.9.0",
     "connect": "~3.6.3",
     "d3-queue": "~3.0.7",