Specifying no sideEffects

Author: mikecousins

packages/react-pdf-js/package.json

@@ -4,6 +4,7 @@
   "description": "Simple React component to wrap up PDF.js. The easiest way to render PDFs in your React app.",
   "author": "mikecousins",
   "license": "MIT",
+  "sideEffects": false,
   "repository": {
     "type": "git",
     "url": "git+https://github.com/mikecousins/react-pdf-js.git"