Fix classifier formatting in pyproject.toml

Author: saimonation

pyproject.toml

@@ -16,10 +16,10 @@ license = "Apache-2.0"
 readme = "README.rst"
 
 classifiers = [
-    "Development_Status :: 5 - Production/Stable",
+    "Development Status :: 5 - Production/Stable",
     "Intended Audience :: Developers",
-    "Operating_System :: OS Independent",
-    "Programming_Language :: Python :: 3",
+    "Operating System :: OS Independent",
+    "Programming Language :: Python :: 3",
     "Topic :: Software Development :: Libraries :: Python Modules"
 ]
 
@@ -30,4 +30,4 @@ Documentation = "https://ctera-python-sdk.readthedocs.io/en/latest/"
 "Source Code" = "https://github.com/ctera/ctera-python-sdk"
 
 [tool.setuptools_scm]
-version_file = "cterasdk/version.py"
+version_file = "cterasdk/version.py"