Update maintainer list.

libs/maintainers.txt

@@ -37,6 +37,7 @@ coroutine             Oliver Kowalke <oliver.kowalke -at- gmail.com>
 coroutine2            Oliver Kowalke <oliver.kowalke -at- gmail.com>
 crc                   Daryle Walker <darylew -at- hotmail.com>
 date_time             Jeff Garland <jeff -at- crystalclearsoftware.com>
+detail                Beman Dawes <bdawes -at- acm.org>, Robert Ramey <ramey -at- rrsd.com>, Rene Rivera <grafikrobot -at- gmail.com>, Andrey Semashev <andrey.semashev -at- gmail.com>
 disjoint_sets         Jeremy Siek <jeremy.siek -at- gmail.com>
 dll                   Antony Polukhin <antoshkka -at- gmail.com>
 dynamic_bitset        Jeremy Siek <jeremy.siek -at- gmail.com>