Remove use of deprecated 'setup.py test' (#187)

Since setuptools v41.5.0 (27 Oct 2019), the 'test' command is formally
deprecated and should not be used.

The pytest-runner package also lists itself as deprecated:
https://github.com/pytest-dev/pytest-runner

> Deprecation Notice
>
> pytest-runner depends on deprecated features of setuptools and relies
> on features that break security mechanisms in pip. For example
> 'setup_requires' and 'tests_require' bypass pip --require-hashes. See
> also pypa/setuptools#1684.

setup.cfg

@@ -1,6 +1,3 @@
-[aliases]
-test=pytest
-
 [bdist_wheel]
 universal = 1
 

setup.py

@@ -1,14 +1,8 @@
 #!/usr/bin/env python
 
-import sys
-
 from setuptools import find_packages, setup
 
 
-needs_pytest = {'pytest', 'test', 'ptr'}.intersection(sys.argv)
-pytest_runner = ['pytest-runner'] if needs_pytest else []
-
-
 # Get version without importing, which avoids dependency issues
 def get_version():
     import re
@@ -55,7 +49,5 @@ def readme():
                    "Topic :: Text Processing :: Linguistic"],
       packages=find_packages(),
       python_requires=">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*",
-      setup_requires=pytest_runner,
-      tests_require=['pytest', 'hypothesis'],
       entry_points={'console_scripts':
                     ['chardetect = chardet.cli.chardetect:main']})