Update 4_project_metadata.md

Author: priya-gitTest

episodes/4_project_metadata.md

@@ -126,5 +126,6 @@ Please add and update the README.md file, in case you havent done so. You can ea
 - The `[build-system]` section is required and must define both `requires` and `build-backend`.
 - The `[project]` section must, at minimum, include the project `name` and `version`.
 - It is recommended to specify dependencies in the `[project]` section for clarity and reproducibility.
+- Use semantic versioning (MAJOR.MINOR.PATCH) for versioning your packages.
 
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