update dependencies (#3002)

acorn 5.5.3
commander 2.15.0

Miscellaneous
- drop unmaintained package from README

README.md

@@ -6,9 +6,8 @@ UglifyJS is a JavaScript parser, minifier, compressor and beautifier toolkit.
 #### Note:
 - **`uglify-js@3` has a simplified [API](#api-reference) and [CLI](#command-line-usage) that is not backwards compatible with [`uglify-js@2`](https://github.com/mishoo/UglifyJS2/tree/v2.x)**.
 - **Documentation for UglifyJS `2.x` releases can be found [here](https://github.com/mishoo/UglifyJS2/tree/v2.x)**.
-- `uglify-js` only supports ECMAScript 5 (ES5).
-- Those wishing to minify
-ES2015+ (ES6+) should use the `npm` package [**uglify-es**](https://github.com/mishoo/UglifyJS2/tree/harmony).
+- `uglify-js` only supports JavaScript (ECMAScript 5).
+- To minify ECMAScript 2015 or above, transpile using tools like [Babel](https://babeljs.io/).
 
 Install
 -------

package.json

@@ -1,7 +1,6 @@
 {
   "name": "uglify-js",
   "description": "JavaScript parser, mangler/compressor and beautifier toolkit",
-  "homepage": "http://lisperator.net/uglifyjs",
   "author": "Mihai Bazon <mihai.bazon@gmail.com> (http://lisperator.net/)",
   "license": "BSD-2-Clause",
   "version": "3.3.14",
@@ -24,16 +23,39 @@
     "LICENSE"
   ],
   "dependencies": {
-    "commander": "~2.14.1",
+    "commander": "~2.15.0",
     "source-map": "~0.6.1"
   },
   "devDependencies": {
-    "acorn": "~5.4.1",
+    "acorn": "~5.5.3",
     "mocha": "~3.5.1",
     "semver": "~5.5.0"
   },
   "scripts": {
     "test": "node test/run-tests.js"
   },
-  "keywords": ["uglify", "uglify-js", "minify", "minifier", "es5"]
+  "keywords": [
+    "cli",
+    "compress",
+    "compressor",
+    "ecma",
+    "ecmascript",
+    "es",
+    "es5",
+    "javascript",
+    "js",
+    "jsmin",
+    "min",
+    "minification",
+    "minifier",
+    "minify",
+    "optimize",
+    "optimizer",
+    "pack",
+    "packer",
+    "parse",
+    "parser",
+    "uglifier",
+    "uglify"
+  ]
 }