fix: return if a valid URL is generated

main.go

@@ -5,7 +5,6 @@ import (
 	"fmt"
 	"io"
 	"io/fs"
-	"net"
 	"net/http"
 	"net/url"
 	"os"
@@ -77,17 +76,11 @@ func sourceFromArg(arg string) (*source, error) {
 
 	// a GitHub or GitLab URL (even without the protocol):
 	src, err := readmeURL(arg)
-	// Return error if it's a network issue.
-	var dnsErr *net.DNSError
-	if errors.As(err, &dnsErr) {
+	if src != nil {
+		// if there's a valid URL created, exit.
 		return src, err
 	}
 
-	if src != nil && err == nil {
-		// if there's an error, try next methods...
-		return src, nil
-	}
-
 	// HTTP(S) URLs:
 	if u, err := url.ParseRequestURI(arg); err == nil && strings.Contains(arg, "://") {
 		if u.Scheme != "" {