Remove travis CI.

darshan-util/pydarshan/.travis.yml

-# Config file for automatic testing at travis-ci.org
-
-language: python
-python:
-  - 3.6
-  - 3.5
-  - 3.4
-  - 2.7
-
-# Command to install dependencies, e.g. pip install -r requirements.txt --use-mirrors
-install: pip install -U tox-travis
-
-# Command to run tests, e.g. python setup.py test
-script: tox
-
-# Assuming you have installed the travis-ci CLI tool, after you
-# create the Github repo and add it to Travis, run the
-# following command to finish PyPI deployment setup:
-# $ travis encrypt --add deploy.password
-deploy:
-  provider: pypi
-  distributions: sdist bdist_wheel
-  user: jakobluettgau
-  password:
-    secure: PLEASE_REPLACE_ME
-  on:
-    tags: true
-    repo: jakobluettgau/pydarshan
-    python: 3.6