Track reached targets in printed AFLGo statics

[wrsturgeon]

Hi,

Thanks for this great library.

I started using LibAFLGo today to experiment with instrumenting Rust binaries, and I noticed that reached targets are often not printed after they have in fact been reached, e.g. in the following format:

[Testcase #0] run time: 0h-0m-0s, clients: 1, corpus: 10, objectives: 0, executions: 4843, exec/sec: 0.000, distance_min: 5, edges: 10/11 (90%), distance_max: 9, targets: 0/256 (0%)

Assuming I understand the situation correctly, I was able to fix this by changing one line, /fuzzers/aflgo/src/lib.rs:264:

-    let targets_feedback = MaxMapFeedback::new(&targets_observer);
+    let targets_feedback = MaxMapFeedback::tracking(&targets_observer, false, true);

Full disclosure: this was found and patched by GPT-5.6 Terra, but I have independently tested the patch on a toy program, and it works.

Please let me know if this was helpful, or if I'm misunderstanding something!

Best,
Will