Update license information (#846)

Author: pvk-developer

pyproject.toml

@@ -5,7 +5,6 @@ authors = [{ name = "MIT Data To AI Lab", email = "dailabmit@gmail.com" }]
 classifiers = [
     'Development Status :: 2 - Pre-Alpha',
     'Intended Audience :: Developers',
-    'License :: OSI Approved :: MIT License',
     'Natural Language :: English',
     'Programming Language :: Python :: 3',
     'Programming Language :: Python :: 3.9',
@@ -17,7 +16,8 @@ classifiers = [
 ]
 keywords = ['sdmetrics', 'SDMetrics']
 dynamic = ['version']
-license = { text = 'MIT license' }
+license = 'MIT'
+license-files = ['LICENSE']
 requires-python = ">=3.9,<3.15"
 readme = 'README.md'
 dependencies = [
@@ -105,7 +105,6 @@ dev = [
 
 [tool.setuptools]
 include-package-data = true
-license-files = ['LICENSE']
 
 [tool.setuptools.packages.find]
 include = ['sdmetrics', 'sdmetrics.*']