Wrap files into a folder inside the archive

Most exporters have folder containing the binary and other files inside the
archive. Let's do this as well.

.goreleaser.yml

@@ -58,6 +58,7 @@ nfpms:
 archives:
   - name_template: "{{ .ProjectName }}_{{ .Version }}_{{ .Os }}_{{ .Arch }}"
     format: tar.gz
+    wrap_in_directory: true
 
 checksum:
   name_template: "{{ .ProjectName }}-{{ .Version }}_checksums.txt"