Change comments (mainly URLs) to no longer specifically say Python 3.3
diff --git a/py/builtinimport.c b/py/builtinimport.c
index c691013..795d9fd 100644
--- a/py/builtinimport.c
+++ b/py/builtinimport.c
@@ -306,7 +306,7 @@
 
                 if (stat == MP_IMPORT_STAT_DIR) {
                     DEBUG_printf("%s is dir\n", vstr_str(&path));
-                    // https://docs.python.org/3.3/reference/import.html
+                    // https://docs.python.org/3/reference/import.html
                     // "Specifically, any module that contains a __path__ attribute is considered a package."
                     mp_store_attr(module_obj, MP_QSTR___path__, mp_obj_new_str(vstr_str(&path), vstr_len(&path), false));
                     vstr_add_char(&path, PATH_SEP_CHAR);