fix(schemas/browsers): remove maxProperties constraint

The built data.json contains multiple browsers.

Author: caugner

schemas/browsers.schema.json

@@ -39,10 +39,8 @@
         "$ref": "#/definitions/browser_statement"
       },
       "minProperties": 1,
-      "maxProperties": 1,
       "errorMessage": {
-        "minProperties": "A browser must be described within the file.",
-        "maxProperties": "Each browser JSON file may only describe one browser."
+        "minProperties": "A browser must be described within the file."
       },
       "tsType": "Record<BrowserName, BrowserStatement>"
     },