update readme

Author: tomirons

README.md

@@ -57,7 +57,7 @@ php artisan export:postman --basic="username:password123"
 The following usage will continue until the end, even if it has error or incompatible endpoints.
 
 ```bash
-php artisan export:postman --continue-on-errors=true
+php artisan export:postman --continue-on-errors
 ```
 
 If both auths are specified, bearer will be favored.