goreleaser: Remove deprecated archives.replacements tag (#127)

This replaces the deprecated archives.replacements tag from
goreleaser.yml file with name_templates tag.

See more in https://goreleaser.com/deprecations/#archivesreplacements.

.goreleaser.yml

@@ -14,12 +14,12 @@ builds:
 # List of replacements generated by goreleaser to match the output of `uname`
 # on various systems. This will make the binary more easily curl-able.
 archives:
-  - replacements:
-      darwin: Darwin
-      linux: Linux
-      windows: Windows
-      386: i386
-      amd64: x86_64
+  - name_template: >-
+      {{ .ProjectName }}_
+      {{- title .Os }}_
+      {{- if eq .Arch "amd64" }}x86_64
+      {{- else if eq .Arch "386" }}i386
+      {{- else }}{{ .Arch }}{{ end }}
 
 checksum:
   name_template: 'checksums.txt'