trim down package size

Author: cspotcode

.npmignore

@@ -6,9 +6,12 @@
  "scripts": {
  "build": "node build.js",
  "serve-tests": "http-server -p 1336",
- "prepublish": "npm run build",
  "test": "mocha"
  },
+ "files": [
+ "source-map-support.js",
+ "register.js"
+ ],
  "dependencies": {
  "buffer-from": "^1.0.0",
  "source-map": "^0.6.0"