Add funding link to package.json (#279)

Author: andywer

package.json

@@ -2,6 +2,7 @@
   "name": "threads",
   "version": "1.6.3",
   "description": "Web workers & worker threads as simple as a function call",
+  "license": "MIT",
   "main": "dist/index.js",
   "module": "dist-esm/index.js",
   "scripts": {
@@ -47,10 +48,10 @@
     "url": "git+https://github.com/andywer/threads.js.git"
   },
   "author": "Andy Wermke (https://github.com/andywer)",
-  "license": "MIT",
   "bugs": {
     "url": "https://github.com/andywer/threads.js/issues"
   },
+  "funding": "https://github.com/andywer/threads.js?sponsor=1",
   "homepage": "https://threads.js.org",
   "keywords": [
     "thread",