Remove printing of headers

lib/dockerhub.nu

@@ -4,7 +4,6 @@ export def get_image_digest [image: string, tag: string] {
     | append [Accept "application/vnd.docker.distribution.manifest.v2+json"]
     | append [Authorization $"Bearer ($token)"]
   ) 
-  print $headers
 
   ( http get -H $headers $"https://registry.hub.docker.com/v2/($image)/manifests/($tag)"
     | from json