tools/verifygitlog.py: Ignore line length in body if it's a URL.

This changes the git commit message line length check to ignore lines that
contain URLs, since these cannot be wrapped without breaking tools that
detect URLs and create a link.

Signed-off-by: David Lechner <david@pybricks.com>

tools/verifygitlog.py

@@ -69,7 +69,8 @@ def warning(err):
 
     # Message body lines.
     for line in raw_body[2:]:
-        if len(line) >= 76:
+        # Long lines with URLs are exempt from the line length rule.
+        if len(line) >= 76 and "://" not in line:
             error("Message lines should be 75 or less characters: " + line)
 
     if not raw_body[-1].startswith("Signed-off-by: ") or "@" not in raw_body[-1]: