Remove resolve_addr::tests::resolve_addr_err (denoland#1531)

On some nameservers bad domain names still resolve.

src/resolve_addr.rs

@@ -153,13 +153,4 @@ mod tests {
  let actual = resolve_addr("[2001:db8::1]:8080").wait().unwrap();
  assert_eq!(actual, expected);
  }
-
- #[test]
- fn resolve_addr_err() {
- let r = resolve_addr("not-a-real-domain.blahblah:8080").wait();
- match r {
- Err(ResolveAddrError::Resolution(_)) => {} // expected
- _ => assert!(false),
- }
- }
 }