<NME> .travis.yml
<BEF> language: python
python:
  - "2.7"

# command to install dependencies
before_install:
 - "pip install --only-binary=numpy,scipy numpy scipy"
 - "pip install pandas"
 - "pip install coveralls"
 - "pip install pytest-cov"
 - "pip install future"
 - "pip install tqdm"
 - "pip install mock"

# command to execute test suite
script: py.test --cov-report= --cov=pylogit/ tests/
branches:
  only:
    - master
    - develop

# Send results of tests to coveralls
after_success:
 - coveralls

<MSG> Added commands to execute test suite for python 3.x during after pushes and merges.

<DFF> @@ -1,6 +1,10 @@
 language: python
 python:
   - "2.7"
+  - "3.3"
+  - "3.4"
+  - "3.5"
+  - "3.6"
 
 # command to install dependencies
 before_install:

Added commands to execute test suite for python 3.x during after pushes and merges.