pad base64 encoding

src/constellation.gleam

@@ -56,7 +56,7 @@ fn hash(string) {
   {string <> "salty salt"}
   |> bit_array.from_string()
   |> glesha.hash(glesha.Sha256)
-  |> bit_array.base64_url_encode(False)
+  |> bit_array.base64_url_encode(True)
   |> string.slice(0, 16)
 }