Chore: extract watch script to standalone package

Author: mysticatea

package.json

@@ -45,10 +45,11 @@
     "rollup-watch": "^4.0.0",
     "typescript": "~2.3.4",
     "typescript-eslint-parser": "^3.0.0",
-    "wait-on": "^2.0.2"
+    "wait-on": "^2.0.2",
+    "warun": "^1.0.0"
   },
   "scripts": {
-    "_mocha": "_mocha \"test/*.js\" --reporter dot",
+    "_mocha": "_mocha \"test/*.js\" --reporter dot --timeout 5000",
     "prebuild": "npm run -s clean",
     "build": "tsc && rollup -c -o index.js && dts-bundle --name vue-eslint-parser --main .temp/index.d.ts --out ../index.d.ts",
     "clean": "rimraf .nyc_output .temp coverage index.*",
@@ -67,8 +68,8 @@
     "watch": "run-p watch:*",
     "watch:tsc": "tsc --watch",
     "watch:rollup": "wait-on .temp/index.js && rollup -c -o index.js --watch",
-    "watch:test": "wait-on index.js && node test/tools/watch.js index.js \"test/*.js\" \"test/fixtures/ast/*/*.json\" \"test/fixtures/*\" -- nyc -r lcov npm run -s _mocha",
-    "watch:update-ast": "wait-on index.js && node test/tools/watch.js index.js \"test/fixtures/ast/*/*.vue\" -- node test/tools/update-fixtures-ast.js",
+    "watch:test": "wait-on index.js && warun index.js \"test/*.js\" \"test/fixtures/ast/*/*.json\" \"test/fixtures/*\" --no-initial -- nyc -r lcov npm run -s _mocha",
+    "watch:update-ast": "wait-on index.js && warun index.js \"test/fixtures/ast/*/*.vue\" -- node test/tools/update-fixtures-ast.js",
     "watch:coverage-report": "wait-on coverage/lcov-report/index.html && opener coverage/lcov-report/index.html"
   },
   "repository": {