removed outdated license identifier

- fix #155
- add license files explicitly
- use LGPL 3.0+ identifier

Author: orbeckst

MANIFEST.in

@@ -1,3 +1,3 @@
 include README.rst INSTALL CHANGELOG COPYING COPYING.LESSER AUTHORS
-include setup.py
+
 

pyproject.toml

@@ -8,7 +8,8 @@ build-backend = "setuptools.build_meta"
 [project]
 name = "GridDataFormats"
 description = "Reading and writing of data on regular grids in Python"
-license = {file = "COPYING.LESSER" }
+license = "LGPL-3.0-or-later"
+license-files = ["COPYING", "COPYING.LESSER", "AUTHORS"]
 authors = [
     {name = "Oliver Beckstein", email = "orbeckst@gmail.com"},
 ]
@@ -19,7 +20,6 @@ classifiers = [
     "Development Status :: 6 - Mature",
     "Environment :: Console",
     "Intended Audience :: Science/Research",
-    "License :: OSI Approved :: GNU Lesser General Public License v3 (LGPLv3)",
     "Operating System :: POSIX",
     "Operating System :: MacOS :: MacOS X",
     "Operating System :: Microsoft :: Windows",