Configure CI with tox and coverage

.coveragerc

@@ -0,0 +1,3 @@
+[report]
+exclude_lines =
+    if __name__ == .__main__.:

.travis.yml

@@ -3,10 +3,16 @@ language: python
 sudo: required
 dist: xenial
 
-python:
-  - "3.5"
-  - "3.6"
-  - "3.7"
+matrix:
+  include:
+    - python: 3.7
+      env: TOXENV=py,codecov
+    - python: 3.6
+      env: TOXENV=py,codecov
+    - python: 3.5
+      env: TOXENV=py,codecov
 
-install: pip install -e .
-script: python -m unittest
+install: 
+  - pip install tox
+
+script: tox

tox.ini

@@ -1,6 +1,18 @@
 [tox]
-envlist = py36, py37
+envlist = py35, py36, py37
 
 [testenv]
+deps =
+    coverage
+
 commands = 
-    python -m unittest
+    coverage run --include=i2plib/* -m unittest
+
+[testenv:codecov]
+passenv = CI TRAVIS TRAVIS_*
+deps = codecov
+skip_install = true
+commands = 
+    coverage combine
+    coverage report
+    codecov