fix: remove 'u' before string characters  as redundant in Python 3
@@ -6,7 +6,7 @@ import re
class ZbxTemplate(object):
plg_type = 'all'
- mainTemplate = u"""<?xml version="1.0" encoding="UTF-8"?>
+ mainTemplate = """<?xml version="1.0" encoding="UTF-8"?>
<zabbix_export>
<version>2.0</version>
<groups>
