Update dependency cypress to v3.8.0

Author: renovate-bot

package-lock.json

@@ -55,7 +55,7 @@
     "deploy": "gatsby build && gh-pages -d public -b master -t"
   },
   "devDependencies": {
-    "cypress": "3.2.0",
+    "cypress": "3.8.0",
     "prettier": "1.17.0",
     "start-server-and-test": "1.9.0"
   },