Update docs and src for new python-dotenv release

{{ cookiecutter.repo_name }}/src/data/make_dataset.py

@@ -1,8 +1,8 @@
 # -*- coding: utf-8 -*-
 import os
 import click
-import dotenv
 import logging
+from dotenv import find_dotenv, load_dotenv
 
 
 @click.command()
@@ -17,9 +17,12 @@ if __name__ == '__main__':
     log_fmt = '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
     logging.basicConfig(level=logging.INFO, format=log_fmt)
 
+    # not used in this stub but often useful for finding various files
     project_dir = os.path.join(os.path.dirname(__file__), os.pardir, os.pardir)
-    dotenv_path = os.path.join(project_dir, '.env')
-    dotenv.load_dotenv(dotenv_path)
+    
+    # find .env automagically by walking up directories until it's found, then
+    # load up the .env entries as environment variables
+    load_dotenv(find_dotenv())
 
     main()