drone - install requirements

.drone.yml

@@ -9,16 +9,19 @@ pipeline:
     image: python:${PY_VERSION}
     commands:
       - pip install -qq pylint
+      - pip install -qq -r requirements.txt
       - find . -name "[^\.]*.py" | xargs pylint
 
   unittest:
     image: python:${PY_VERSION}
     commands:
+      - pip install -qq -r requirements.txt
       - find . -name "test_*.py" | xargs python
 
   coverage:
     image: python:${PY_VERSION}
     commands:
       - pip install -qq coverage
+      - pip install -qq -r requirements.txt
       - find . -name "test_*.py" | xargs coverage run
       - coverage report -m --fail-under=90