remove pytest-runner from setup.py

fixes #77

Author: sebix

pytest.ini

@@ -1,3 +1,3 @@
 [pytest]
 testpaths = tests
-addopts = --cov=textile --cov-report=html --cov-append --cov-report=term-missing
+addopts = --cov=textile --cov-report=html --cov-append --cov-report=term-missing

setup.py

@@ -4,21 +4,6 @@
 import sys
 
 
-class PyTest(TestCommand):
-    user_options = [('pytest-args=', 'a', "Arguments to pass to pytest")]
-
-    def initialize_options(self):
-        TestCommand.initialize_options(self)
-        self.pytest_args = []
-
-    def run_tests(self):
-        import shlex
-        #import here, cause outside the eggs aren't loaded
-        import pytest
-        errno = pytest.main(shlex.split(self.pytest_args))
-        sys.exit(errno)
-
-
 def get_version():
     basedir = os.path.dirname(__file__)
     with open(os.path.join(basedir, 'textile/version.py')) as f:
@@ -48,6 +33,7 @@ def get_version():
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
         'Topic :: Software Development :: Libraries :: Python Modules',
     ],
     keywords='textile,text,html markup',
@@ -60,10 +46,8 @@ def get_version():
         'imagesize': ['Pillow>=3.0.0'],
     },
     entry_points={'console_scripts': ['pytextile=textile.__main__:main']},
-    setup_requires=['pytest-runner'],
     tests_require=['pytest', 'pytest-cov'],
-    cmdclass = {'test': PyTest},
     include_package_data=True,
     zip_safe=False,
-    python_requires='~=3.5',
+    python_requires='>=3.5',
 )