Add missing equals sign to goreleaser hc-releases command

Author: bflad

.goreleaser.yml

@@ -45,7 +45,7 @@ publishers:
     # Terraform CLI 0.10 - 0.11 perform discovery via HTTP headers on releases.hashicorp.com
     # For providers which have existed since those CLI versions, exclude
     # discovery by setting the protocol version headers to 5.
-    cmd: hc-releases upload-file {{ abs .ArtifactPath }} -header=x-terraform-protocol-version=5 -header=x-terraform-protocol-versions=5.0 -upload-name {{ .ArtifactName }}
+    cmd: hc-releases upload-file {{ abs .ArtifactPath }} -header=x-terraform-protocol-version=5 -header=x-terraform-protocol-versions=5.0 -upload-name={{ .ArtifactName }}
     env:
       - AWS_ACCESS_KEY_ID={{ .Env.AWS_ACCESS_KEY_ID }}
       - AWS_SECRET_ACCESS_KEY={{ .Env.AWS_SECRET_ACCESS_KEY }}