Bump version to 1.3.0.post0

Author: A5rocks

src/outcome/_version.py

@@ -4,4 +4,4 @@
 if TYPE_CHECKING:
     from typing_extensions import Final
 
-__version__: 'Final[str]' = "1.3.0+dev"
+__version__: 'Final[str]' = "1.3.0.post0"