fix ok envelope test.

fixes https://github.com/nbd-wtf/go-nostr/pull/106

justfile

@@ -3,6 +3,7 @@ build-all:
     for dir in (find . -maxdepth 1 -type d -name "nip*")
         go build "./$dir"
     end
+    go build ./
     go build ./nson
     go build ./binary
 
@@ -11,5 +12,6 @@ test-all:
     for dir in (find . -maxdepth 1 -type d -name "nip*")
         go test "./$dir"
     end
+    go test ./
     go test ./nson
     go test ./binary