Fix flake8 issue.

It's new in the latest version of flake - thanks travis for letting me know.

Author: Byron

git/objects/submodule/base.py

@@ -578,11 +578,13 @@ def update(self, recursive=False, init=True, to_latest_revision=False, progress=
 base_commit=mrepo.merge_base(mrepo.head.commit, hexsha)
 iflen(base_commit) ==0orbase_commit[0].hexsha==hexsha:
 ifforce:
-log.debug("Will force checkout or reset on local branch that is possibly in the future of"
-+"the commit it will be checked out to, effectively 'forgetting' new commits")
+msg="Will force checkout or reset on local branch that is possibly in the future of"
+msg+="the commit it will be checked out to, effectively 'forgetting' new commits"
+log.debug(msg)
 else:
-log.info("Skipping %s on branch '%s' of submodule repo '%s' as it contains "
-+"un-pushed commits", is_detachedand"checkout"or"reset", mrepo.head, mrepo)
+msg="Skipping %s on branch '%s' of submodule repo '%s' as it contains un-pushed commits"
+msg%= (is_detachedand"checkout"or"reset", mrepo.head, mrepo)
+log.info(msg)
 may_reset=False
 # end handle force
 # end handle if we are in the future