Update reference to default config file location in README (#272)

Author: boardfish

README.md

@@ -299,7 +299,7 @@ The Playwright CLI can be configured using a JSON configuration file. You can sp
 playwright-cli --config path/to/config.json open example.com
 ```
 
-Playwright CLI will load config from `playwright-cli.json` by default so that you did not need to specify it every time.
+Playwright CLI will load config from `.playwright/cli.config.json` by default so that you did not need to specify it every time.
 
 <details>
 <summary>Configuration file schema</summary>