Fix extension error

Author: Ebedthan

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "sabreur"
-version = "0.3.2"
+version = "0.3.3"
 authors = ["Anicet Ebou <anicet.ebou@gmail.com>"]
 edition = "2018"
 exclude = ["CODE_OF_CONDUCT.md", "tests/*", "benches/*", ".github/*", ".cargo/*"]

Cargo.toml

@@ -372,7 +372,7 @@ fn main() -> Result<()> {
                 // Create unknown file
                 let mut unk_path = PathBuf::from("");
                 unk_path.push(output);
-                unk_path.push(format!("{}{}", "unknown.fa", ext));
+                unk_path.push(format!("{}{}", "unknown.fq", ext));
 
                 let future_unk_path = unk_path.clone();