Bump json-store version to 4.0 and officially drop support for Python 2

Author: brainsik

json_store/__init__.py

@@ -2,6 +2,6 @@
 
 from .json_store import JSONStore
 
-__version__ = "3.2"
+__version__ = "4.0"
 
 open = JSONStore

setup.py

@@ -28,14 +28,12 @@
         "Intended Audience :: Developers",
         "License :: OSI Approved :: MIT License",
         "Operating System :: OS Independent",
-        "Programming Language :: Python :: 2",
-        "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
+        "Programming Language :: Python :: 3.12",
         "Programming Language :: Python :: Implementation :: CPython",
         "Programming Language :: Python :: Implementation :: PyPy",
     ],