fix: update license format in pyproject.toml and add GPLv3+ classifier

Author: phillipus85

README.md

@@ -2,7 +2,7 @@
 
 <div align="center">
 
-[![PyPI](https://img.shields.io/pypi/v/pydasa?cache=none)](https://pypi.org/project/pydasa/) [![Python Version](https://img.shields.io/pypi/pyversions/pydasa)](https://pypi.org/project/pydasa/) [![License](https://img.shields.io/github/license/DASA-Design/PyDASA)](https://github.com/DASA-Design/PyDASA/blob/main/LICENSE) [![Documentation Status](https://readthedocs.org/projects/pydasa/badge/?version=latest)](https://pydasa.readthedocs.io) [![codecov](https://codecov.io/gh/DASA-Design/PyDASA/graph/badge.svg)](https://codecov.io/gh/DASA-Design/PyDASA)
+[![PyPI](https://img.shields.io/pypi/v/pydasa?cache=none)](https://pypi.org/project/pydasa/) [![Python Version](https://img.shields.io/pypi/pyversions/pydasa)](https://pypi.org/project/pydasa/) [![License](https://img.shields.io/github/license/DASA-Design/PyDASA)](https://github.com/DASA-Design/PyDASA/blob/main/LICENSE) [![Documentation Status](https://readthedocs.org/projects/pydasa/badge/?version=latest)](https://pydasa.readthedocs.io)[![codecov](https://codecov.io/github/DASA-Design/PyDASA/graph/badge.svg?token=UZFT3CURK1)](https://codecov.io/github/DASA-Design/PyDASA)
 
 </div>
 

docs/source/index.rst

@@ -22,7 +22,7 @@ PyDASA
    :target: https://pydasa.readthedocs.io
    :alt: Documentation Status
 
-.. |coverage| image:: https://codecov.io/gh/DASA-Design/PyDASA/graph/badge.svg
+.. |coverage| image:: https://codecov.io/github/DASA-Design/PyDASA/graph/badge.svg?token=UZFT3CURK1
    :target: https://codecov.io/gh/DASA-Design/PyDASA
    :alt: Coverage
 

pyproject.toml

@@ -8,14 +8,15 @@ dynamic = ["version"]
 description = "PyDASA is a Python library for dimensional analysis using the Buckingham Pi theorem across scientific and engineering domains."
 readme = "README.md"
 requires-python = ">=3.10"
-license = "GPL-3.0-or-later"
+license = {text = "GPL-3.0-or-later"}
 authors = [
     {name = "@SFAM", email = "sa-artea@uniandes.edu.co"}
 ]
 classifiers = [
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)",
     "Development Status :: 3 - Alpha",
     "Operating System :: OS Independent",
     "Intended Audience :: Science/Research",