Increments package version to 0.1.5

Updates the package version in pyproject.toml from 0.1.4 to 0.1.5.

This increment signifies a new release with potential bug
fixes, new features, or other improvements.

Author: josedejesuschavez

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "ddd-value-objects"
-version = "0.1.4"
+version = "0.1.5"
 description = "A collection of base classes for Domain-Driven Design (DDD) value objects and entities in Python"
 readme = "README.md"
 license = {text = "MIT"}