New upstream version 1.12.0

.github/dependabot.yml

.github/workflows/codeql-analysis.yml

.github/workflows/go.yml

.github/workflows/golangci-lint.yml

.gitmodules

.golangci.toml

.travis.yml

README.md

appveyor.yml

decoder.go

decoder_test.go

deserializer.go

deserializer_test.go

errors.go

example_test.go

go.mod

go.sum

mmap_unix.go

mmap_windows.go

node.go