also suggest direnv in addition to dotenv

README.md

@@ -200,4 +200,4 @@ Executing a specific test, whether it is a `live_call` or not, will execute it c
 
 When doing local development on the `LangChain` library itself, rename the `.envrc_template` to `.envrc` and populate it with your private API values. This is only used when running live test when explicitly requested.
 
-Use a tool like [Dotenv](https://github.com/motdotla/dotenv) to load the API values into the ENV when using the library locally.
+Use a tool like [Direnv](https://direnv.net/) or [Dotenv](https://github.com/motdotla/dotenv) to load the API values into the ENV when using the library locally.