v0.18.0

Added

• Index regeneration checks record data checksum (#215)

Changed

• ring crate replaced with sha2 crate (#246)
• async-std replaced with async-lock to avoid redundant dependencies (#247)
• Change locks for filters update (#218)
• Serialization moved out of critical section (#188)
• Removed multiple header checksum calculations (#206)
• Rename functions to show that it returns last entry (#199)