Add codecov

.drone.yml

@@ -13,6 +13,8 @@ steps:
   image: python:3.6
   environment:
     COUCH_URL: 'http://couchdb:5984'
+    CODECOV_TOKEN:
+      from_secret: CODECOV_TOKEN
   commands:
   # Install pre-requisites
   - pip install coverage pytest
@@ -22,3 +24,6 @@ steps:
   # Run tests
   - coverage run -m pytest
   - coverage report -m
+  # Upload coverage report
+  - pip install codecov
+  - codecov