feat(filetype): add justfile

Co-authored-by: zer0-x <zer0-x.7ty50@aleeas.com>
Signed-off-by: Christina Sørensen <christina@cafkafk.com>

src/info/filetype.rs

@@ -51,6 +51,7 @@ impl FileExtensions {
                     | "Gruntfile.coffee"
                     | "Gruntfile.js"
                     | "Justfile"
+                    | "justfile"
                     | "Makefile"
                     | "makefile"
                     | "Makefile.in"