Make Python 3.8 minimum requirement

setup.cfg

@@ -24,7 +24,6 @@ classifiers =
     Operating System :: POSIX :: Linux
     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
@@ -54,10 +53,9 @@ install_requires =
     pluggy>=0.13.0
     reportlab>=3.5.66
     tqdm>=4
-    importlib-metadata>=4;python_version<'3.8'  # until Python 3.8
     importlib-resources>=5;python_version<'3.9'  # until Python 3.9
     typing-extensions>=4;python_version<'3.10'
-python_requires = >=3.7
+python_requires = >=3.8
 include_package_data = True
 package_dir =
     =src
@@ -100,7 +98,7 @@ ocrmypdf =
     py.typed
 
 [bdist_wheel]
-python-tag = py37
+python-tag = py38
 
 [aliases]
 test = pytest