Release v2.1.0

Fix golangci-lint problem

Release v2.0.0

Update go version for CI

Release v1.4.0

Use context for closing batch instance

Release v1.3.0

Improve performance

Release v1.2.0

Refactor processor method

Release v1.1.1

Add tet for batch close function

Release v1.1.0

Remove locking mechanism

Release v1.0.0

Update README.md