chore: add package.json.scripts.bump

Author: coolaj86

package.json

@@ -4,6 +4,7 @@
   "description": "Determine Host Target Triplet (Arch, Libc, OS, Vendor) from a filenames / download URL and uname / User-Agent strings.",
   "main": "index.js",
   "scripts": {
+    "bump": "npm version -m \"chore(release): bump to v%s\"",
     "fmt": "npm run prettier",
     "lint": "npm run jshint",
     "test": "node lexver-test.js",