Update dependency intersection-observer to v0.12.0

Author: renovate-bot

package-lock.json

@@ -57,7 +57,7 @@
     "glamorous": "^4.13.1",
     "graphql": "0.13.2",
     "graphql-tag": "^2.10.0",
-    "intersection-observer": "0.5.0",
+    "intersection-observer": "0.12.0",
     "intro.js": "^2.9.3",
     "isomorphic-fetch": "2.2.1",
     "localforage": "^1.7.3",