Run doctests and unittests as part of automated testing

* Switch default version to Python 3.7.
* Add 3.7 to the supported versions list.
* Remove redundant test.py.

This test module was basic and is being replaced by doctests and unittests.

.travis.yml

@@ -3,10 +3,11 @@ python:
 - '2.7'
 - '3.5'
 - '3.6'
+- '3.7'
 install:
 - pip install -U setuptools pip -r build-requirements.txt
 script:
-- python ./test.py
+- pytest --doctest-modules --cov=anybadge anybadge.py tests
 deploy:
 - provider: pypi
   user: jongracecox
@@ -16,7 +17,7 @@ deploy:
   on:
     tags: true
     all_branches: true
-    python: '3.6'
+    python: '3.7'
 - provider: pypi
   user: jongracecox
   password:
@@ -24,4 +25,4 @@ deploy:
   distributions: sdist bdist_wheel
   on:
     branch: master
-    python: '3.6'
+    python: '3.7'

test.py

@@ -1,15 +0,0 @@
-#!/usr/bin/python
-"""
-anybadge test module.
-"""
-
-import anybadge
-
-if __name__ == '__main__':
-
-    thresholds={2: 'red', 4: 'orange', 6: 'green', 8: 'brightgreen'}
-
-    badge = anybadge.Badge('test', '2.22', value_suffix='%',
-                           thresholds=thresholds, text_color='#010101,#101010')
-
-    print(badge.badge_svg_text)