build: lost rimraf

Author: Scrum

package.json

@@ -81,6 +81,7 @@
     "posthtml-css-modules": "^0.1.3",
     "posthtml-custom-elements": "^1.1.0",
     "read-pkg": "^3.0.0",
+    "rimraf": "^2.6.2",
     "tempfile": "^2.0.0"
   },
   "readme": "posthtml/posthtml-cli/readme",