MAINT: Update README

Update README format
Move most metadata to setup.cfg
Clean setup.py

closes #891

Author: bashtage

setup.cfg

@@ -1,3 +1,32 @@
+[metadata]
+name = pandas-datareader
+description = Pandas-compatible data readers. Formerly a component of pandas.
+long_description = file: README.md
+long_description_content_type = text/markdown
+url = https://pandas.pydata.org
+author = The PyData Development Team
+author_email = [email protected]
+license = BSD-3-Clause
+license_file = LICENSE.md
+platforms = any
+classifiers =
+    Development Status :: 5 - Production/Stable
+    Environment :: Console
+    Intended Audience :: Science/Research
+    License :: OSI Approved :: BSD License
+    Operating System :: OS Independent
+    Programming Language :: Python
+    Programming Language :: Python :: 3
+    Programming Language :: Python :: 3 :: Only
+    Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
+    Topic :: Scientific/Engineering
+project_urls =
+    Bug Tracker = https://github.com/pydata/pandas-datareader/issues
+    Documentation = http://pydata.github.io/pandas-datareader
+    Source Code = https://github.com/pydata/pandas-datareader
+
 [versioneer]
 VCS = git
 style = pep440

setup.py

@@ -5,48 +5,14 @@
 
 import versioneer
 
-NAME = "pandas-datareader"
-
-
-def readme():
-    with open("README.md") as f:
-        return f.read()
-
-
-install_requires = []
 with open("./requirements.txt") as f:
     install_requires = f.read().splitlines()
-with open("./requirements-dev.txt") as f:
-    tests_require = f.read().splitlines()
 
 setup(
-    name=NAME,
     version=versioneer.get_version(),
     cmdclass=versioneer.get_cmdclass(),
-    description="Data readers extracted from the pandas codebase,"
-    "should be compatible with recent pandas versions",
-    long_description=readme(),
-    license="BSD License",
-    author="The PyData Development Team",
-    author_email="[email protected]",
-    url="https://github.com/pydata/pandas-datareader",
-    classifiers=[
-        "Development Status :: 4 - Beta",
-        "Environment :: Console",
-        "Intended Audience :: Science/Research",
-        "Operating System :: OS Independent",
-        "Programming Language :: Python",
-        "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.6",
-        "Programming Language :: Python :: 3.7",
-        "Programming Language :: Python :: 3.8",
-        "Topic :: Scientific/Engineering",
-    ],
-    keywords="data",
     install_requires=install_requires,
     packages=find_packages(exclude=["contrib", "docs", "tests*"]),
-    test_suite="tests",
-    tests_require=tests_require,
     zip_safe=False,
     python_requires=">=3.6",
 )