Added click module to requirements.txt file (theskumar#59)

pjona · theskumar · commit 77dc37d0c1f7 · 2017-08-08T17:05:11.000+05:30
It's used in `tests/fixtures.py` file: ``` from click.testing import CliRunner ``` Check also Travis build: https://travis-ci.org/theskumar/python-dotenv/jobs/236861670
diff --git a/requirements.txt b/requirements.txt
@@ -5,3 +5,4 @@ bumpversion
 wheel
 pytest-cov
 pytest-flake8
+click
