Fix typos in services.py

services.py

@@ -1,5 +1,6 @@
-import version_repository
-import release_type
+from version_repository import VersionRepository
+from release_type import ReleaseType
+
 class InitReleaseService():
 
     def __init__(self, commit_id, file):
@@ -15,7 +16,7 @@ class InitReleaseService():
 
     def get_version(self, release_type):
         self.version_repo = VersionRepository(self.file)
-        return repo.get_version(release_type)
+        return self.version_repo.get_version(release_type)
 
     def create_release_version(self):
         commit_message = self.read_commit_message(self.commit_id)