Add missing imports and cleanup

release_type.py

@@ -1,3 +1,4 @@
+from enum import Enum
 class ReleaseType(Enum):
     MAJOR = 0
     MINOR = 1

version.py

@@ -1,4 +1,4 @@
-from enum import Enum
+from release_type import ReleaseType
 from file_handlers import FileHandler
 
 class Version():

version_repository.py

@@ -25,7 +25,7 @@ class VersionRepository():
         return version_list, is_snapshot
 
     @classmethod
-    def get(cls, file) -> VersionRepository:
+    def get(cls, file):
         inst = cls(file)
 
         file_handler= inst.load_file(file)