Update requirements.txt

Author: algattik

environment_setup/requirements.txt

@@ -1,10 +1,12 @@
 pytest>=5.3
+pytest-cov>=2.8.1
 requests>=2.22
 numpy>=1.17
 pandas>=0.25
 scikit-learn>=0.21.3
 azureml-sdk>=1.0
 python-dotenv>=0.10.3
 flake8>=3.7
-flake8_formatter_junit_xml
+flake8_formatter_junit_xml>=0.0.6
+tox>=3.14.3
 azure-cli==2.0.76