fix some linting

src/main/python/ddadevops/domain/artifact.py

@@ -4,10 +4,12 @@ from .common import (
     Validateable,
 )
 
+
 class ArtifactType(Enum):
     TEXT = 0
     JAR = 1
 
+
 class Artifact(Validateable):
     def __init__(self, path: str):
         self.path_str = path
@@ -40,4 +42,3 @@ class Artifact(Validateable):
 
     def __hash__(self) -> int:
         return self.__str__().__hash__()
-