pantalaimon: Add travis configuration.

.travis.yml

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+language: python
+dist: xenial
+sudo: false
+before_install:
+    - wget https://matrix.org/git/olm/snapshot/olm-2.3.0.tar.bz2
+    - tar -xvf olm-2.3.0.tar.bz2
+    - pushd olm-2.3.0 && make && sudo make PREFIX="/usr" install && popd
+    - rm -r olm-2.3.0
+
+matrix:
+    include:
+        - python: 3.6
+          env: TOXENV=py36
+        - python: 3.7
+          env: TOXENV=py37
+        - python: 3.7
+          env: TOXENV=coverage
+
+install: pip install tox-travis
+script: tox
+
+after_success:
+    - bash <(curl -s https://codecov.io/bash)

tox.ini

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+# content of: tox.ini , put in same dir as setup.py
+[tox]
+envlist = py36,py37,coverage
+[testenv]
+basepython =
+    py36: python3.6
+    py37: python3.7
+    py3: python3.7
+
+deps = -rtest-requirements.txt
+install_command = pip install {opts} {packages}
+
+passenv = TOXENV CI TRAVIS TRAVIS_*
+commands = pytest
+usedevelop = True
+
+[testenv:coverage]
+basepython = python3.7
+commands =
+    py.test --cov=nio --cov-report term-missing
+    coverage xml
+    coverage report --show-missing
+    codecov -e TOXENV
+deps =
+    coverage
+    codecov>=1.4.0
+setenv =
+    COVERAGE_FILE=.coverage