Log errors

src/runner.rs

@@ -45,7 +45,8 @@ impl<'a> Runner<'a> {
                     }
                     break;
                 }
-                Err(_) => {
+                Err(e) => {
+                    debug!("Step {:?} failed: {:?}", key, e);
                     let interrupted = ctrlc::interrupted();
                     if interrupted {
                         ctrlc::unset_interrupted();