chore: remove obsolete dependencies

Author: TheAlexLichter

package.json

@@ -77,7 +77,6 @@
     "bili": "^3.1.2",
     "cheerio": "^1.0.0-rc.2",
     "codecov": "latest",
-    "cross-env": "^5.2.0",
     "eslint": "^5.7.0",
     "eslint-config-standard": "^12.0.0-alpha.0",
     "eslint-plugin-import": "^2.14.0",
@@ -95,9 +94,7 @@
     "vue-jest": "^2.6.0",
     "vue-loader": "^15.4.2",
     "vue-server-renderer": "^2.5.17-beta.0",
-    "vue-template-compiler": "^2.5.17-beta.0",
-    "webpack": "^4.20.2",
-    "webpack-dev-server": "^3.1.9"
+    "vue-template-compiler": "^2.5.17-beta.0"
   },
   "dependencies": {
     "vue": "^2.5.17-beta.0"