Update docs

CONTRIBUTING.md

@@ -16,7 +16,7 @@ To contribute, follow these steps:
 6. The CI system will run the full test-suite over your code including all unit and integration tests, so include appropriate tests
   with the PR.
 
-7. [Codacy](https://www.codacy.com/) will perform an automated code review.
+7. [Deepsource](https://deepsource.io) will perform an automated code review.
   Fix any issues which cause a failed check, and add the commit to your PR.
 
 8. You will also be required to sign a standard Contributor License Agreement (CLA), which is administered automatically through [CLA Assistant](https://cla-assistant.io/).

README.md

@@ -1,6 +1,5 @@
 # <img src="https://github.com/nautechsystems/nautilus_trader/blob/develop/docs/_images/nautilus-trader-logo.png" width="500">
 
-[![codacy-quality](https://api.codacy.com/project/badge/Grade/a1d3ccf7bccb4483b091975681a5cb23)](https://app.codacy.com/gh/nautechsystems/nautilus_trader?utm_source=github.com&utm_medium=referral&utm_content=nautechsystems/nautilus_trader&utm_campaign=Badge_Grade_Dashboard)
 [![codecov](https://codecov.io/gh/nautechsystems/nautilus_trader/branch/master/graph/badge.svg?token=DXO9QQI40H)](https://codecov.io/gh/nautechsystems/nautilus_trader)
 ![pythons](https://img.shields.io/pypi/pyversions/nautilus_trader)
 ![pypi-version](https://img.shields.io/pypi/v/nautilus_trader)