Merge pull request #1610 from jrcarl624/patch-1

Updated if3.rs: Added a note that states that the test does not need to be changed.

exercises/if/if3.rs

@@ -29,6 +29,7 @@ pub fn animal_habitat(animal: &str) -> &'static str {
     habitat
 }
 
+// No test changes needed.
 #[cfg(test)]
 mod tests {
     use super::*;