replaced codecov python uploader with bash uploader.

.drone.yml

@@ -30,9 +30,7 @@ steps:
   commands:
   - pip install -r requirements.txt
   - py.test --cov-report=xml --cov=src test
-  - pip install codecov
-  - codecov -t CODECOV_TOKEN
-      
+  - bash <(curl -s https://codecov.io/bash)
 trigger:
   branch:
   - master