fix: removed "sideEffect" property to fix the demo build (#571)

Author: alexkuchun

package.json

@@ -11,7 +11,6 @@
   "repository": "[email protected]:signavio/react-stick.git",
   "author": "Jan-Felix Schwarz <[email protected]>",
   "license": "MIT",
-  "sideEffects": false,
   "scripts": {
     "commit": "commit",
     "prebuild": "npm run clean",