build(setup.py): Fix quotes

Author: tony

setup.py

@@ -46,18 +46,18 @@
     zip_safe=False,
     keywords=about['__title__'],
     classifiers=[
-        'Development Status :: 5 - Production/Stable',
+        "Development Status :: 5 - Production/Stable",
         "License :: OSI Approved :: MIT License",
         "Operating System :: POSIX",
         "Operating System :: MacOS :: MacOS X",
-        'Environment :: Web Environment',
-        'Intended Audience :: Developers',
-        'Programming Language :: Python',
-        'Programming Language :: Python :: 2.7',
-        'Programming Language :: Python :: 3.5',
-        'Programming Language :: Python :: 3.6',
-        'Programming Language :: Python :: 3.7',
-        'Programming Language :: Python :: Implementation :: PyPy',
+        "Environment :: Web Environment",
+        "Intended Audience :: Developers",
+        "Programming Language :: Python",
+        "Programming Language :: Python :: 2.7",
+        "Programming Language :: Python :: 3.5",
+        "Programming Language :: Python :: 3.6",
+        "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: Implementation :: PyPy",
         "Topic :: Utilities",
         "Topic :: System :: Shells",
     ],