Add browser entry to package.json, see #995

Author: dcodeIO

package.json

@@ -1,6 +1,6 @@
 {
   "name": "protobufjs",
-  "version": "6.8.6",
+  "version": "6.8.7",
   "versionScheme": "~",
   "description": "Protocol Buffers for JavaScript (& TypeScript).",
   "author": "Daniel Wirtz <[email protected]>",
@@ -18,6 +18,7 @@
     "typescript"
   ],
   "main": "index.js",
+  "browser": "dist/protobuf.js",
   "types": "index.d.ts",
   "bin": {
     "pbjs": "bin/pbjs",