chore: update package.json

Author: cossssmin

package.json

@@ -1,7 +1,7 @@
 {
   "name": "posthtml-postcss",
   "version": "0.5.0",
-  "description": "PostHTML-PostCSS plugin. Use PostCSS in HTML document",
+  "description": "Use PostCSS in PostHTML",
   "license": "MIT",
   "repository": "posthtml/posthtml-postcss",
   "author": "Ivan Voischev <voischev.ivan@ya.ru>",
@@ -17,7 +17,7 @@
     "pretest": "npm run lint"
   },
   "files": [
-    "lib/"
+    "lib"
   ],
   "keywords": [
     "posthtml",