Fix archives format in goreleaser (#224)

Also update go.sum based on whatever remained there after building

Author: petoju

.goreleaser.yml

@@ -31,7 +31,7 @@ builds:
         goarch: "386"
     binary: "{{ .ProjectName }}_v{{ .Version }}"
 archives:
-  - format: zip
+  - formats: ['zip']
     name_template: "{{ .ProjectName }}_{{ .Version }}_{{ .Os }}_{{ .Arch }}"
 checksum:
   name_template: "{{ .ProjectName }}_{{ .Version }}_SHA256SUMS"