[meta] Exclude fs from browser bundles (#565)

Author: fregante

package.json

@@ -3,6 +3,9 @@
     "version": "4.14.0",
     "description": "tap-producing test harness for node and browsers",
     "main": "index.js",
+    "browser": {
+        "fs": false
+    },
     "bin": "./bin/tape",
     "directories": {
         "example": "example",