v0.5.0

• Add new type: Two as two values version

v0.4.0

• (#1) Use sync.Once instead of mutex ( Thanks @yulin-li )
• (#2) Improved mutex ( Thanks @antonvlasov )

v0.3.0

• Add the function: New

v0.2.0

• Use Generics with Go 1.18 beta 1

v0.1.0

• The first version