In `export`, add the `uid` of records.
The code already exported the uid of shared folders.  It makes sense
to export the uid of the records themselves as well!
@@ -77,6 +77,7 @@ class KeeperJsonExporter(BaseExporter):
for r in records:
if type(r) == Record:
ro = {
+ 'uid': r.uid or '',
'title': r.title or '',
'login': r.login or '',
'password': r.password or '',
