fix: import lib and use mod into example

01.workspace/oxydice_lib/examples/roll_3d6.rs

@@ -1,3 +1,5 @@
+use oxydice_lib::*;
+
 fn main() {
-    let dice = Dice::grab(3, 6);
+    let dice = dice::Dice::grab(3, 6);
 }