siegfried: Update to 1.8.0 version

[mamedin]

• Build version v1.8.0-1, with custom archivematica configuration
• (Ubuntu) Use DH_GOPKG=github.com/richardlehane/siegfried/cmd... (See https://github.com/richardlehane/siegfried/pull/98)
• Use Go 1.13

The DH_GOPKG=github.com/richardlehane/siegfried/cmd... was already used on v1.7 CentOS package.

Connects to https://github.com/archivematica/Issues/issues/1075

[mamedin]

I updated go to 1.13 because:

artefactual@am110xenial:~/src/siegfried$ go install -tags archivematica -v github.com/richardlehane/siegfried/cmd/... | grep -i "requires Go"
github.com/richardlehane/siegfried/internal/persist
go build github.com/richardlehane/siegfried/internal/persist: module requires Go 1.13
golang.org/x/sys/unix
go build golang.org/x/sys/unix: module requires Go 1.12
github.com/richardlehane/siegfried/internal/checksum
go build github.com/richardlehane/siegfried/internal/checksum: module requires Go 1.13
golang.org/x/image/riff
go build golang.org/x/image/riff: module requires Go 1.12
github.com/richardlehane/xmldetect
go build github.com/richardlehane/xmldetect: module requires Go 1.12
github.com/richardlehane/siegfried/pkg/config
go build github.com/richardlehane/siegfried/pkg/config: module requires Go 1.13
github.com/richardlehane/siegfried/pkg/loc/internal/mappings
go build github.com/richardlehane/siegfried/pkg/loc/internal/mappings: module requires Go 1.13
github.com/richardlehane/siegfried/pkg/mimeinfo/internal/mappings
go build github.com/richardlehane/siegfried/pkg/mimeinfo/internal/mappings: module requires Go 1.13
github.com/richardlehane/siegfried/pkg/pronom/internal/mappings
go build github.com/richardlehane/siegfried/pkg/pronom/internal/mappings: module requires Go 1.13
github.com/richardlehane/siegfried/internal/chart
go build github.com/richardlehane/siegfried/internal/chart: module requires Go 1.13

[mamedin]

Thanks @sevein , I just changed it. Merging!