add style field

Author: zbryikt

package.json

@@ -4,7 +4,11 @@
   "license": "MIT",
   "description": "Pure CSS Loader Optimized for the Web",
   "version": "2.0.0",
+  "style": "dist/index.min.css",
   "homepage": "https://github.com/loadingio/css-spinner",
+  "files": [
+    "dist/**/*"
+  ],
   "repository": {
     "type": "git",
     "url": "https://github.com/loadingio/css-spinner"