Enable Travis on all branches, not only on master, add Python versions

.travis.yml

@@ -4,18 +4,18 @@
 language: python
 
 python:
+  - "2.7"
+  - "3.4"
+  - "3.5"
   - "3.6"
-
-branches:
-  only:
-    - master
-    - v0.6
-    - v0.5
+  - "3.7"
+  - "3.8"
 
 services: mongodb
 
 # Install test dependencies
 before_install:
+  - python --version
   - pip install pytest pytest-cov
   - pip install codecov
 
@@ -25,7 +25,7 @@ install:
 
 # Run automated tests
 script:
-  - py.test --cov flask_user --cov-report term-missing --cov-config flask_user/tests/.coveragerc flask_user/tests
+  - pytest --cov flask_user --cov-report term-missing --cov-config flask_user/tests/.coveragerc flask_user/tests
 
 # Submit coverage report to coveralls
 after_success: