Update and simplify package.json

package.json

@@ -14,24 +14,19 @@
     "templates",
     "ejs"
   ],
-  "main": "./mustache.js",
+  "main": "mustache.js",
   "bin": {
     "mustache": "./bin/mustache"
   },
   "files": [
-    "mustache.js",
+    "bin/",
     "mustache.mjs",
     "mustache.min.js",
-    "bin",
-    "wrappers",
-    "LICENSE"
+    "wrappers/"
   ],
   "volo": {
     "url": "https://raw.github.com/janl/mustache.js/{version}/mustache.js"
   },
-  "engines": {
-    "npm": ">=1.4.0"
-  },
   "scripts": {
     "build": "rollup mustache.mjs --file mustache.js --format umd --name Mustache --banner '// This file has been generated from mustache.mjs' && uglifyjs mustache.js > mustache.min.js",
     "test": "npm run test-lint && npm run test-unit",