Update README.md

Co-authored-by: Peter Stöckli <p-@github.com>

Author: m-y-mo

README.md

@@ -454,7 +454,7 @@ taskflow:
       model: gpt_latest
 ```
 
-Model version can then be updated by changing `gpt_latest` in the `model_config` file and applied across all taskflows that uses the config.
+Model version can then be updated by changing `gpt_latest` in the `model_config` file and applied across all taskflows that use the config.
 
 ## Passing environment variables