MAINTAINERS: mention that people are welcome to pick up and maintain older releases

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

MAINTAINERS

@@ -449,6 +449,7 @@ Releases
 1.1                                     Michael Niedermayer
 1.0                                     Michael Niedermayer
 
+If you want to maintain an older release, please contact us
 
 
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