A .env file in the working directory is now optional

README.md

@@ -46,8 +46,8 @@ Configuration is read from, in increasing priority:
    given with `--config`
 3. `JOBSEARCH_*` environment variables, e.g. `JOBSEARCH_LOGGING_LEVEL=debug`
 
-A `.env` file in the working directory is loaded into the environment first,
-and must exist.
+A `.env` file in the working directory, if there is one, is loaded into the
+environment first.
 
 Example `config.yaml`:
 ```yaml