pushed sphinx version

Author: pancetta

.travis.yml

@@ -17,7 +17,7 @@ before_install:
 
 install:
   - conda install --yes python=${TRAVIS_PYTHON_VERSION} pip numpy future scipy matplotlib nose pep8 coverage mpi4py sympy dill numba
-  - conda install --yes sphinx=1.6.3
+  - conda install --yes sphinx
   - conda install --yes -c conda-forge petsc4py
   - conda list
   - pip install coloredlogs