build: drop not use pkg

Author: Scrum

package.json

@@ -46,18 +46,14 @@
     "cpy": "^6.0.0",
     "eslint": "^4.15.0",
     "eslint-config-standard": "^11.0.0-beta.0",
-    "eslint-formatter-pretty": "^1.3.0",
     "eslint-plugin-ava": "^4.4.0",
     "eslint-plugin-babel": "^4.1.2",
     "eslint-plugin-import": "^2.8.0",
     "eslint-plugin-markdown": "^1.0.0-beta.7",
-    "eslint-plugin-node": "^5.2.1",
-    "eslint-plugin-promise": "^3.6.0",
     "eslint-plugin-standard": "^3.0.1",
     "execa": "^0.9.0",
     "husky": "^0.14.3",
     "lint-staged": "^6.0.1",
-    "np": "^2.18.3",
     "nyc": "^11.4.1",
     "path-exists": "^3.0.0",
     "posthtml-bem": "^0.2.2",