Updating python_requires and classifiers

Author: acabarbaye

setup.py

@@ -34,15 +34,19 @@
     },
     python_requires='>=2.7.10, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.0, !=3.4.1, !=3.4.2, <4',
     classifiers=(
+        'Development Status :: 5 - Production/Stable',
+        'Intended Audience :: Developers',
+        'License :: OSI Approved :: Apache Software License',
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
-        "License :: OSI Approved :: Apache Software License",
-        "Operating System :: OS Independent",
+        'Programming Language :: Python',
+        'Topic :: Internet',
+        'Topic :: Software Development :: Embedded Systems',
+        'Topic :: Software Development :: Object Brokering',
     ),
     install_requires=[
         "pyserial>=3.0,<4.0",