Shorten python version support range

Author: MrLightful

pyproject.toml

@@ -16,12 +16,6 @@ classifiers = [
     'Natural Language :: English',
     'License :: OSI Approved :: MIT License',
     "Programming Language :: Python",
-    "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",
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
@@ -31,7 +25,7 @@ classifiers = [
 ]
 
 [tool.poetry.dependencies]
-python = ">=2"
+python = ">=3.7,<4.0"
 appdirs = "^1.4.4"
 future = "^0.18.3"
 packaging = "^23.2"