refactor: move constants to git_flow module

src/git_flow/command/base.py

@@ -1,9 +1,10 @@
 from git_flow import (
     BRANCH_TYPES,
     REPOSITORY_TOKEN_FILENAME,
+    FLOWCONFIG_FILENAME,
     GitFlowError,
 )
-from git_flow.git import FLOWCONFIG_FILE, Git
+from git_flow.git import Git
 from git_flow.remote.base import RemoteAPI
 from git_flow.remote.bitbucket import BitbucketRemoteAPI
 from git_flow.remote.github import GithubRemoteAPI
@@ -16,7 +17,7 @@ TYPE_ERROR = 2
 TYPE_INFO = 3
 
 
-flowconfig = Git.get_config(FLOWCONFIG_FILE) if isfile(FLOWCONFIG_FILE) else {}
+flowconfig = Git.get_config(FLOWCONFIG_FILENAME) if isfile(FLOWCONFIG_FILENAME) else {}
 
 
 def ensure_initialized():