releases: consistent OS name in release artifacts

Author: joemiller

.goreleaser.yml

@@ -35,7 +35,7 @@ archives:
   - id: archives
     name_template: >-
       {{ .ProjectName }}_
-      {{- title .Os }}_
+      {{- .Os }}_
       {{- if eq .Arch "amd64" }}amd64
       {{- else if eq .Arch "386" }}i386
       {{- else }}{{ .Arch }}{{ end }}