🔧 Update pyproject metadata (#5)

pyproject.toml

@@ -1,10 +1,36 @@
 [tool.poetry]
 name = "poetry-version-plugin"
 version = "0.1.2"
-description = ""
+description = "Poetry plugin for dynamically extracting the package version from a __version__ variable or a Git tag."
 authors = ["Sebastián Ramírez <[email protected]>"]
+homepage = "https://github.com/tiangolo/poetry-version-plugin"
+documentation = "https://github.com/tiangolo/poetry-version-plugin"
 readme = "README.md"
 packages = [{include = "poetry_version_plugin"}]
+classifiers = [
+    "Intended Audience :: Developers",
+    "Intended Audience :: Information Technology",
+    "Intended Audience :: System Administrators",
+    "Operating System :: OS Independent",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python",
+    "Topic :: Software Development :: Libraries :: Application Frameworks",
+    "Topic :: Software Development :: Libraries :: Python Modules",
+    "Topic :: Software Development :: Libraries",
+    "Topic :: Software Development :: Version Control :: Git",
+    "Topic :: Software Development",
+    "Topic :: System :: Archiving :: Packaging",
+    "Topic :: System :: Installation/Setup",
+    "Topic :: System :: Software Distribution",
+    "Development Status :: 3 - Alpha",
+    "Programming Language :: Python :: 3 :: Only",
+    "Programming Language :: Python :: 3.6",
+    "Programming Language :: Python :: 3.7",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "License :: OSI Approved :: MIT License"
+]
 
 [tool.poetry.dependencies]
 python = "^3.6"