Merge branch 'master' into refactor-hints

exercises/tests/tests3.rs

@@ -4,6 +4,8 @@
 // we expect to get when we call `is_even(5)`.
 // Execute `rustlings hint tests3` for hints :)
 
+// I AM NOT DONE
+
 pub fn is_even(num: i32) -> bool {
     num % 2 == 0
 }