attempt at adding coveralls support to drone runs

.drone.yml

@@ -17,8 +17,8 @@ steps:
   - pip install --default-timeout 60 coveralls && export HAS_COVERALLS=1
   - python setup.py install
   - flake8 --exit-zero rdflib
-  - PYTHONWARNINGS=default nosetests --with-timer --timer-top-n 42 --with-coverage --cover-tests --cover-package=rdflib
-  - coverage report
+  - PYTHONWARNINGS=default nosetests --with-timer --timer-top-n 42
+
 
 ---
 kind: pipeline
@@ -31,15 +31,26 @@ platform:
 steps:
 - name: test
   image: python:3.7
+  environment:
+    COVERALLS_SERVICE_NAME: RDFLib-Drone
+    COVERALLS_REPO_TOKEN:
+      from_secret: coveralls_token
   commands:
+  - export COVERALLS_SERVICE_NUMBER="$DRONE_BUILD_NUMBER"
+  - export COVERALLS_SERVICE_JOB_ID="$DRONE_STAGE_NAME"
+  - export COVERALLS_SERVICE_JOB_NUMBER="$DRONE_STAGE_NUMBER"
+  - export COVERALLS_FLAG_NAME="$DRONE_STAGE_KIND"
+  - export COVERALLS_GIT_REPO="$DRONE_REPO_NAME"
+  - export COVERALLS_GIT_BRANCH="$DRONE_SOURCE_BRANCH"
   - bash .travis.fuseki_install_optional.sh
   - pip install --default-timeout 60 -r requirements.txt
   - pip install --default-timeout 60 -r requirements.dev.txt
   - pip install --default-timeout 60 coveralls && export HAS_COVERALLS=1
   - python setup.py install
   - flake8 --exit-zero rdflib
   - PYTHONWARNINGS=default nosetests --with-timer --timer-top-n 42 --with-coverage --cover-tests --cover-package=rdflib
-  - coverage report
+  - coverage report --skip-covered
+  - coveralls
 
 ---
 kind: pipeline
@@ -59,5 +70,5 @@ steps:
   - pip install --default-timeout 60 coveralls && export HAS_COVERALLS=1
   - python setup.py install
   - flake8 --exit-zero rdflib
-  - PYTHONWARNINGS=default nosetests --with-timer --timer-top-n 42 --with-coverage --cover-tests --cover-package=rdflib
-  - coverage report
+  - PYTHONWARNINGS=default nosetests --with-timer --timer-top-n 42
+