Do not output errors in the middle of the config

config.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"fmt"
-	"log"
 	"net/url"
 )
 
@@ -22,8 +21,7 @@ func config(redirects []Redirect) error {
 	for _, redirect := range redirects {
 		sourceURL, err := url.Parse(redirect.sourceURL)
 		if err != nil {
-			log.Printf("skipping redirect: unable to parse source URL '%s': %v", redirect.sourceURL, err)
-			continue
+			return fmt.Errorf("unable to parse source URL '%s': %v", redirect.sourceURL, err)
 		}
 
 		fmt.Printf("edit \"%s\"\n", redirect.sourceURL)