doc: fix typo

Author: calebdw

README.md

@@ -234,7 +234,7 @@ Thank you for considering contributing! You can read the contribution guide [her
 
 Laraflake is open-sourced software licensed under the [MIT license](LICENSE).
 
-## Acknowledgements
+## Acknowledgments
 
 Derived from [caneara/snowflake](https://github.com/caneara/snowflake) which is no longer maintained.
 The actual Snowflake generation is handled by the excellent [godruoyi/php-snowflake](https://github.com/godruoyi/php-snowflake) library.