Update esm to the latest version 🚀 (#197)

* fix(package): update esm to version 3.0.21

* chore(package): update lockfile

https://npm.im/greenkeeper-lockfile

package-lock.json

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-      "resolved": "https://registry.npmjs.org/webpack-hot-middleware/-/webpack-hot-middleware-2.22.1.tgz",
-      "integrity": "sha512-wbjnvcc3HOPKRE/L0KmTv2MrByfLFOJlVFNKo5Svxy+1plR/bMIMYQDgB4pUOzJXhiBLU7Clp6P1SSzS89iKxA==",
-      "requires": {
-        "ansi-html": "0.0.7",
-        "html-entities": "1.2.1",
-        "querystring": "0.2.0",
-        "strip-ansi": "3.0.1"
-      }
-    },
     "webpack-sources": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/webpack-sources/-/webpack-sources-1.1.0.tgz",

package.json

@@ -41,7 +41,7 @@
     "cross-env": "5.1.4",
     "css-loader": "0.28.11",
     "escape-html": "1.0.3",
-    "esm": "3.0.20",
+    "esm": "3.0.21",
     "events": "2.0.0",
     "express": "4.16.3",
     "fg-loadcss": "2.0.1",