Fix for API change in importlib_resources

The fixed get_copyright_notice will only work in python>=3.7.
The overhead for keeping compatibility with more versions is not
warranted.

This function may be removed in the future anyway.

setup.cfg

@@ -33,7 +33,6 @@ zip_safe = false
 include_package_data = true
 python_requires = >=3.6
 install_requires =
-    importlib_resources
     numpy
     minrpc>=0.1.0
 

src/cpymad/__init__.py

@@ -30,5 +30,10 @@
 
 
 def get_copyright_notice() -> str:
-    from importlib_resources import read_text
+    try:
+        from importlib.resources import files
+        def read_text(package, resource, **kwargs):
+            return files(package).joinpath(resource).read_text(**kwargs)
+    except ImportError:
+        from importlib.resources import read_text
     return read_text('cpymad.COPYING', 'cpymad.rst', encoding='utf-8')