Bump linkinator from 2.1.2 to 2.1.3 (#458)

Bumps [linkinator](https://github.com/JustinBeckwith/linkinator) from 2.1.2 to 2.1.3.
- [Release notes](https://github.com/JustinBeckwith/linkinator/releases)
- [Commits](JustinBeckwith/linkinator@v2.1.2...v2.1.3)

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package.json

@@ -44,7 +44,7 @@
     "find-unused-sass-variables": "^2.0.0",
     "hugo-bin": "^0.63.1",
     "js-yaml": "^3.14.0",
-    "linkinator": "^2.1.2",
+    "linkinator": "^2.1.3",
     "npm-run-all": "^4.1.5",
     "postcss-cli": "^7.1.2",
     "purgecss": "^2.3.0",