Updated travis build

Author: avmarchenko

.travis.yml

@@ -12,7 +12,7 @@ install:
     - conda install --yes python=$TRAVIS_PYTHON_VERSION
     - conda install -c conda-forge --yes jupyter notebook ipywidgets ipyparallel
     - conda config --add channels https://conda.anaconda.org/exaanalytics
-    - conda install --yes exa
+    - conda install --yes numba exa
     - pip install sphinxcontrib-autoanysrc coverage codecov python-coveralls
     - python setup.py install
     - exa -uu