build(deps): remove unnecessary @types/cssnano (#212)

Author: felipecrs

package.json

@@ -51,7 +51,6 @@
   },
   "dependencies": {
     "@rollup/pluginutils": "^4.1.2",
-    "@types/cssnano": "^5.0.0",
     "cosmiconfig": "^7.0.1",
     "cssnano": "^5.0.16",
     "fs-extra": "^10.0.0",