Add coveralls

.travis.yml

@@ -1,14 +1,15 @@
 dist: xenial
 language: python
 python:
-  # - "3.7"
+  - "3.7"
   - "3.6"
 #- '3.5' TODO: Compatibility with Py 3.5
 
 install:
 - pip install -r requirements.txt
 - pip install pytest
 - pip install pprintpp
+- pip install coveralls
 #- mkdir -p ~/.aws
 #- echo "[default]\naws_access_key_id = $a\naws_secret_access_key = $s\n" > ~/.aws/credentials
 #- cat ~/.aws/credentials
@@ -17,5 +18,6 @@ install:
 
 script:
 - pytest tests
+- coveralls
 # - pytest tests/unit
 #- pytest --cov . --cov-branch --cov-config=.coveragerc