Remove 'browser' field from main jimp package's package.json. (#918)

Author: wallabra

packages/jimp/package.json

@@ -4,7 +4,6 @@
   "description": "An image processing library written entirely in JavaScript (i.e. zero external or native dependencies)",
   "main": "dist/index.js",
   "module": "es/index.js",
-  "browser": "browser/lib/jimp.js",
   "types": "types/index.d.ts",
   "typesVersions": {
     ">=3.1.0-0": {