Update dependency python-dotenv to v0.17.1

Author: renovate-bot

requirements.txt

@@ -7,7 +7,7 @@ idna==3.1; python_version >= "3.4"
 itsdangerous==1.1.0; python_version >= "2.7" and python_full_version < "3.0.0" or python_full_version >= "3.5.0"
 jinja2==2.11.2; python_version >= "2.7" and python_full_version < "3.0.0" or python_full_version >= "3.5.0"
 markupsafe==1.1.1; python_version >= "2.7" and python_full_version < "3.0.0" or python_full_version >= "3.5.0"
-python-dotenv==0.15.0
+python-dotenv==0.17.1
 uwsgi==2.0.19.1
 werkzeug==1.0.1; python_version >= "2.7" and python_full_version < "3.0.0" or python_full_version >= "3.5.0"
 wtforms==2.3.3