Added test information to README. Updated circleci config.

Author: RidleyLarsen

.circleci/config.yml

@@ -48,7 +48,7 @@ jobs:
           name: run tests
           command: |
             . venv/bin/activate
-            python manage.py test
+            pytest test
 
       - store_artifacts:
           path: test-reports

README.md

@@ -1,2 +1,5 @@
 # python-demandapi-client
 A Python client library for the Dynata Demand API
+
+# Testing
+Use the command `pytest tests` to run the tests for this project.