keyfile declared but not used

[DamienCassou]

$ go run main.go 
go: downloading golang.org/x/crypto v0.20.0
go: downloading github.com/ProtonMail/go-crypto v1.0.0
go: downloading golang.org/x/term v0.18.0
go: downloading golang.org/x/sys v0.18.0
go: downloading github.com/cloudflare/circl v1.3.7
# command-line-arguments
./main.go:46:3: keyfile declared but not used

$ go version
go version go1.18.1 linux/amd64

Because of #4, I had to patch go.mod:

diff --git a/go.mod b/go.mod
index 9aeb8c0..7a7da55 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module gpg2age
 
-go 1.21.8
+go 1.21
 
 require (
        github.com/ProtonMail/go-crypto v1.0.0

[DamienCassou]

I think #3 fixed this.