[devel] Updated comments that mention 1.5.3; changed them to 1.5.4.

pngerror.c

diff --git a/pngerror.c b/pngerror.c
index c3ce249..c9a1781 100644
--- a/pngerror.c
+++ b/pngerror.c
@@ -507,7 +507,7 @@
 {
 #ifdef PNG_CONSOLE_IO_SUPPORTED
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
-   /* Check on NULL only added in 1.5.3 */
+   /* Check on NULL only added in 1.5.4 */
    if (error_message != NULL && *error_message == PNG_LITERAL_SHARP)
    {
       /* Strip "#nnnn " from beginning of error message. */