Adding pytest coverage

.gitignore

@@ -1,3 +1,4 @@
 *.pyc
 *.swp
-.cache/
+.cache/
+.coverage

.travis.yml

@@ -1,8 +1,17 @@
 dist: xenial
 language: python
+env:
+  global:
+    - CC_TEST_REPORTER_ID=3d0abe23b60c405d5de7e038f366649a8002c4ccedccabad3da0e3b3e9b5049b
 python:
   - "2.7.15"
   - "3.7.1"
+before_script:
+  - curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter
+  - chmod +x ./cc-test-reporter
+  - ./cc-test-reporter before-build
 script:
-  - pytest
+  - pytest --cov=southwest --cov=checkin --cov=openflights
-  - pycodestyle *.py --show-source --ignore=E501
+  - pycodestyle *.py --show-source --ignore=E501
+after_script:
+  - ./cc-test-reporter after-build --exit-code $TRAVIS_TEST_RESULT

requirements.txt

@@ -1,7 +1,9 @@
+coverage
 datetime
 docopts
 pycodestyle
 pytest
+pytest-cov
 pytest-mock
 python-dateutil
 pytz