Require Cython ≥ 0.28.

Needed for extern docstring syntax.

References: commit afeb42a

.github/workflows/ci.yml

@@ -8,11 +8,11 @@ jobs:
       matrix:
         include:
         - python: '2.7'
-          cython: cython==0.24
+          cython: cython==0.28
         - python: '2.7'
         - python: '3.5'
           os: ubuntu-20.04
-          cython: cython==0.24
+          cython: cython==0.28
         - python: '3.6'
           os: ubuntu-20.04
         - python: '3.7'

doc/README

@@ -107,7 +107,7 @@ Prerequisites
 To build the module, you will need:
 
 * Python 2.6+ or 3.2+
-* Cython ≥ 0.24 (only at build time)
+* Cython ≥ 0.28 (only at build time)
 
 *py-afl-fuzz* requires AFL proper to be installed.
 

pyproject.toml

@@ -1,7 +1,7 @@
 [build-system]
 requires = [
     'setuptools', 'wheel',  # needed only to make pip happy
-    'Cython>=0.24',
+    'Cython>=0.28',
 ]
 
 # vim:ts=4 sts=4 sw=4 et

setup.py

@@ -84,7 +84,7 @@ def get_version():
 if os.name != 'posix':
     raise RuntimeError('non-POSIX systems are not supported')
 
-min_cython_version = '0.24'
+min_cython_version = '0.28'
 try:
     import Cython
 except ImportError: