Update goreleaser config to add the 'v' prefix and remove default values for those variables

.goreleaser.yml

@@ -24,7 +24,7 @@ builds:
     flags:
       - -trimpath #removes all file system paths from the compiled executable
     ldflags:
-      - '-s -w -X main.Version={{.Version}} -X main.VersionPrerelease= '
+      - '-s -w -X main.Version=v{{.Version}} -X main.VersionPrerelease= '
     goos:
       - linux
     goarch:

main.go

@@ -13,18 +13,22 @@ import (
 
 var (
 	// Version is the main version number that is being run at the moment.
-	Version = "0.3.1"
+	Version string
 
 	// VersionPrerelease is A pre-release marker for the Version. If this is ""
 	// (empty string) then it means that it is a final release. Otherwise, this
 	// is a pre-release such as "dev" (in development), "beta", "rc1", etc.
-	VersionPrerelease = ""
+	VersionPrerelease string
 
 	// PluginVersion is used by the plugin set to allow Packer to recognize
 	// what version this plugin is.
-	PluginVersion = version.InitializePluginVersion(Version, VersionPrerelease)
+	PluginVersion *version.PluginVersion
 )
 
+func init() {
+	PluginVersion = version.InitializePluginVersion(Version, VersionPrerelease)
+}
+
 func main() {
 	pps := plugin.NewSet()
 	pps.RegisterBuilder("iso", new(iso.Builder))