Bump Cython version in CI to 0.28

Author: xhochy

ci/circle-27-compat.yaml

@@ -4,7 +4,7 @@ channels:
   - conda-forge
 dependencies:
   - bottleneck=1.0.0
-  - cython=0.24
+  - cython=0.28
   - jinja2=2.8
   - numexpr=2.4.4 # we test that we correctly don't use an unsupported numexpr
   - numpy=1.9.2

ci/travis-27-locale.yaml

@@ -4,7 +4,7 @@ channels:
   - conda-forge
 dependencies:
   - bottleneck=1.0.0
-  - cython=0.24
+  - cython=0.28
   - lxml
   - matplotlib=1.4.3
   - numpy=1.9.2

ci/travis-27.yaml

@@ -5,7 +5,7 @@ channels:
 dependencies:
   - beautifulsoup4
   - bottleneck
-  - cython=0.24
+  - cython=0.28
   - fastparquet
   - feather-format
   - flake8=3.4.1

doc/source/install.rst

@@ -253,7 +253,7 @@ Optional Dependencies
 ~~~~~~~~~~~~~~~~~~~~~
 
 * `Cython <http://www.cython.org>`__: Only necessary to build development
-  version. Version 0.24 or higher.
+  version. Version 0.28 or higher.
 * `SciPy <http://www.scipy.org>`__: miscellaneous statistical functions, Version 0.14.0 or higher
 * `xarray <http://xarray.pydata.org>`__: pandas like handling for > 2 dims, needed for converting Panels to xarray objects. Version 0.7.0 or higher is recommended.
 * `PyTables <http://www.pytables.org>`__: necessary for HDF5-based storage. Version 3.0.0 or higher required, Version 3.2.1 or higher highly recommended.