v0.4.8-beta

Changelog

• 6d5968b: Add retry in backup prepare & Fix backup size lost bug (#284) (@wayblink)
• 04725d6: Add some log about flush (@wayblink)
• b646d72: Fix possible stuck during restore in server mode (@wayblink)
• 3ef8e81: Support gc pause during backup (#291) (@wayblink)
• 4f1785b: fix size lost (#286) (@wayblink)
• a1b1a33: update go.mod (@wayblink)