Update classifiers in pyproject.toml

Author: mrcdr

pyproject.toml

@@ -6,6 +6,16 @@ license = "MIT"
 description = "Lanczos diagonalization library: Python interface with C++ implementation"
 readme = "README.md"
 keywords = ["Lanczos", "diagonalization", "C++", "Python"]
+classifiers = [
+    "Development Status :: 5 - Production/Stable",
+    "Intended Audience :: Developers",
+    "Intended Audience :: Science/Research",
+    "License :: OSI Approved :: MIT License",
+    "Operating System :: OS Independent",
+    "Programming Language :: C++",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3 :: Only",
+]
 dependencies = ["numpy"]
 
 [project.urls]