Update dependency intersection-observer to v0.12.2

Author: renovate[bot]

package-lock.json

@@ -47,7 +47,7 @@
     "disqus-react": "1.1.5",
     "emoji-regex": "9.2.2",
     "es-cookie": "1.3.2",
-    "intersection-observer": "0.12.0",
+    "intersection-observer": "0.12.2",
     "npm-run-all": "4.1.5",
     "object-assign": "4.1.1",
     "process": "0.11.10",