Merge pull request #398 from guardicore/bugfix/remove-travis-python-3

remove python 3 build from travis

.travis.yml

@@ -3,12 +3,6 @@ language: python
 cache: pip
 python:
     - 2.7
-    - 3.6
-matrix:
-    include:
-        - python: 3.7
-          dist: xenial    # required for Python 3.7 (travis-ci/travis-ci#9069)
-          sudo: required  # required for Python 3.7 (travis-ci/travis-ci#9069)
 install:
     #- pip install -r requirements.txt
     - pip install flake8  # pytest  # add another testing frameworks later