Update dependency python-dotenv to v0.19.2

Author: renovate-bot

requirements.txt

@@ -19,7 +19,7 @@ pandas==1.1.5; python_full_version >= "3.6.1"
 plotly==4.14.0; python_version >= "2.7" and python_full_version < "3.0.0" or python_full_version >= "3.3.0"
 protobuf==3.14.0; python_version >= "2.7" and python_full_version < "3.0.0" or python_full_version >= "3.5.0"
 python-dateutil==2.8.1; python_full_version >= "3.6.1"
-python-dotenv==0.15.0
+python-dotenv==0.19.2
 pytz==2020.4; python_full_version >= "3.6.1"
 retrying==1.3.3; python_version >= "2.7" and python_full_version < "3.0.0" or python_full_version >= "3.3.0"
 six==1.15.0; python_full_version >= "3.6.1"