Merge pull request #36 from smooth-code/perf-side-effect

perf: add "sideEffects: false" in package.json

Author: gregberge

package.json

@@ -10,6 +10,7 @@
     "material-ui",
     "bootstrap"
   ],
+  "sideEffects": false,
   "main": "dist/smooth-ui.cjs.js",
   "module": "dist/smooth-ui.es.js",
   "jsnext:main": "dist/smooth-ui.es.js",