remove old grunt command

Author: ichiriac

package.json

@@ -1,14 +1,13 @@
 {
   "name": "php-parser",
-  "version": "3.0.0-alpha2",
+  "version": "3.0.0-alpha.3",
   "description": "Parse PHP code and returns its AST",
   "main": "src/index.js",
   "browser": "dist/php-parser.js",
   "scripts": {
     "lint": "prettier --write src/*.js src/**/*.js",
     "pretest": "npm run lint",
     "test": "jest",
-    "generate-docs": "grunt doc",
     "prebuild": "npm run test",
     "build": "webpack --config webpack.config.js",
     "postbuild": "npm run build-docs",
@@ -22,7 +21,7 @@
   "bugs": {
     "url": "https://github.com/glayzzle/php-parser/issues"
   },
-  "homepage": "http://glayzzle.com/php-parser/",
+  "homepage": "https://glayzzle.com/",
   "keywords": [
     "php",
     "php5",