chore(package): update embed-js to version 4.2.1

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -28,7 +28,7 @@
     "brace": "^0.10.0",
     "classnames": "^2.2.5",
     "css-effects": "^0.1.4",
-    "embed-js": "4.1.17",
+    "embed-js": "4.2.1",
     "eve": "^0.5.1",
     "flowchart.js": "^1.6.5",
     "github-markdown-css": "^2.4.1",