deps: Delete unused `async-stacktrace` dependency

src/package-lock.json

@@ -955,11 +955,6 @@
       "resolved": "https://registry.npmjs.org/async/-/async-3.2.1.tgz",
       "integrity": "sha512-XdD5lRO/87udXCMC9meWdYiR+Nq6ZjUfXidViUZGu2F1MO4T3XwZ1et0hb2++BgLfhyJwy44BGB/yx80ABx8hg=="
     },
-    "async-stacktrace": {
-      "version": "0.0.2",
-      "resolved": "https://registry.npmjs.org/async-stacktrace/-/async-stacktrace-0.0.2.tgz",
-      "integrity": "sha1-i7uXh+OzjINscpp+nXwIYw210e8="
-    },
     "asynckit": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",

src/package.json

@@ -31,7 +31,6 @@
   ],
   "dependencies": {
     "async": "^3.2.1",
-    "async-stacktrace": "0.0.2",
     "channels": "0.0.4",
     "clean-css": "^5.1.5",
     "cookie-parser": "1.4.5",