message: Add sponsor link to package.json
diff: },
  "homepage": "https://github.com/nicoespeon/abracadabra",
  "bugs": "https://github.com/nicoespeon/abracadabra/issues",
  + "sponsor": {
  + "url": "https://github.com/sponsors/nicoespeon"
  + },
  "keywords": [
  "refactor",
  "legacy code",
  