Compute coverage of unit tests

.travis.yml

@@ -7,4 +7,7 @@ before_install:
 install:
  - pip install -r requirements.txt
 # command to run tests
-script: python setup.py test
\ No newline at end of file
+script:
+ - coverage run --source=ucoinpy setup.py test
+after_success:
+ - coveralls
\ No newline at end of file