Replace govendor with go mod

.gitlab-ci.yml

Makefile

go.mod

go.sum

tools.go

vendor/github.com/BurntSushi/toml/COMPATIBLE

vendor/github.com/BurntSushi/toml/COPYING

vendor/github.com/BurntSushi/toml/Makefile

vendor/github.com/BurntSushi/toml/README.md

vendor/github.com/BurntSushi/toml/decode.go

vendor/github.com/BurntSushi/toml/decode_meta.go

vendor/github.com/BurntSushi/toml/doc.go

vendor/github.com/BurntSushi/toml/encode.go

vendor/github.com/BurntSushi/toml/encoding_types.go

vendor/github.com/BurntSushi/toml/encoding_types_1.1.go

vendor/github.com/BurntSushi/toml/lex.go

vendor/github.com/BurntSushi/toml/parse.go

vendor/github.com/BurntSushi/toml/session.vim

vendor/github.com/BurntSushi/toml/type_check.go

vendor/github.com/BurntSushi/toml/type_fields.go