fix(deps): update dependency gatsby-plugin-algolia to v0.20.1

Author: renovate-bot

package.json

@@ -10,7 +10,7 @@
     "gatsby": "2.13.15",
     "gatsby-awesome-pagination": "0.3.5",
     "gatsby-image": "2.2.5",
-    "gatsby-plugin-algolia": "0.11.0",
+    "gatsby-plugin-algolia": "0.20.1",
     "gatsby-plugin-manifest": "2.2.2",
     "gatsby-plugin-offline": "2.2.2",
     "gatsby-plugin-postcss": "2.1.1",