build: note package is side effect free in package.json

ChristianMurphy · ChristianMurphy · commit 7f8b45ef39bf · 2020-12-11T20:59:43.000-07:00
diff --git a/package.json b/package.json
@@ -7,6 +7,7 @@
   "main": "dist/index.js",
   "module": "dist/react-markdown.esm.js",
   "typings": "dist/index.d.ts",
+  "sideEffects": false,
   "files": [
     "dist",
     "src"
