chore: Update package metadata with corresponding Python versions

Author: amotl

setup.py

@@ -25,7 +25,7 @@ def read(path):
     keywords="synology, synology-diskstation, snmp, snmpv3, monitoring, monitoring-plugin, nagios, icinga2, icinga2-plugin",
     py_modules=["check_synology"],
     entry_points={"console_scripts": ["check_synology = check_synology"]},
-    python_requires=">=3.4",
+    python_requires=">=3.6",
     install_requires=["easysnmp>=0.2.6,<1"],
     extras_require={
         "test": [
@@ -41,7 +41,13 @@ def read(path):
         "Operating System :: OS Independent",
         "Environment :: Console",
         "Programming Language :: Python",
+        "Programming Language :: Python",
         "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: 3.6",
+        "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: Implementation :: CPython",
         "Intended Audience :: Developers",
         "Intended Audience :: Education",