Bump Cython to v0.29.

.travis.yml

@@ -8,6 +8,7 @@ matrix:
       sudo: true
 
 install:
+  - pip install Cython==0.29
   - pip install -e .
 script:
   - python setup.py test

requirements_dev.txt

@@ -1,5 +1,5 @@
 CoilMQ>=1.0.1
-Cython==0.28.4
+Cython==0.29
 Flask>=0.12.2
 HiYaPyCo>=0.4.11
 Pillow>=4.3.0

setup.py

@@ -16,7 +16,7 @@ from os import path
 import lakesuperior
 
 # Use this version to build C files from .pyx sources.
-CYTHON_VERSION='0.28.4'
+CYTHON_VERSION='0.29'
 
 try:
     import Cython