Remove travis config

.travis.yml

@@ -1,17 +0,0 @@
-sudo: false
-language: python
-python:
-  - "3.4"
-  - "3.5"
-  - "3.6"
-cache:
-  directories:
-    - $HOME/.cache/pip
-install:
-  - pip install -U pip setuptools
-  - pip install -r dev-requirements.txt -U
-  - python setup.py develop
-  - pip freeze
-script: py.test --cov=./
-after_success:
-  - codecov