Added support for codecov

Author: TomSlater

.coverage

@@ -0,0 +1 @@
+!coverage.py: This is a private format, don't read it directly!{"lines":{}}

.travis.yml

@@ -2,6 +2,7 @@ language: python
 
 python:
 - "3.6"
+- "3.7"
 
 install:
   - pip install -r requirements.txt
@@ -11,10 +12,14 @@ install:
 
 script:
   - pytest
+  - py.test --cov-report term --cov=app/test/
   - cd docs
   - make html
   - touch _build/html/.nojekyll
 
+after_success:
+  - codecov
+
 deploy:
   provider: pages
   skip_cleanup: true