fix(browser): expose "SchemaTypeOptions"

like in the non-browser build

Author: hasezoey

lib/browser.js

@@ -83,6 +83,15 @@ exports.VirtualType = require('./virtualType');
 
 exports.SchemaType = require('./schemaType.js');
 
+/**
+ * The constructor used for schematype options
+ *
+ * @method SchemaTypeOptions
+ * @api public
+ */
+
+exports.SchemaTypeOptions = require('./options/schemaTypeOptions');
+
 /**
  * Internal utils
  *