bump new version (6.4.0)

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = cashews
-version = 6.3.0
+version = 6.4.0
 url = https://github.com/Krukov/cashews/
 author = Dmitry Kryukov
 author_email = [email protected]
@@ -18,19 +18,18 @@ classifiers =
     Programming Language :: Python
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3 :: Only
-    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
 
 [options]
-python_requires = >=3.7
+python_requires = >=3.8
 packages = find:
 include_package_data = true
 zip_safe = false
 install_requires =
-    typing_extensions;python_version=='3.7'
+    typing_extensions;python_version=='3.8'
 
 [options.packages.find]
 exclude =