chore: add `publish=false` (#9)

fix #8

Cargo.toml

@@ -4,6 +4,7 @@ version = "0.6.3"
 authors = ["Felix Spöttel <1682504+fspoettel@users.noreply.github.com>"]
 edition = "2021"
 default-run = "aoc"
+publish = false
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]