MAINTAINERS: add myself as elf2dmp maintainer

Add myself as contrib/elf2dmp maintainer and elf2dmp as maintained.
Signed-off-by: NViktor Prutyanov <viktor.prutyanov@phystech.edu>
Message-Id: <20180918095422.4468-1-viktor.prutyanov@phystech.edu>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

MAINTAINERS

@@ -1903,6 +1903,11 @@ S: Maintained
 F: include/qemu/iova-tree.h
 F: util/iova-tree.c
 
+elf2dmp
+M: Viktor Prutyanov <viktor.prutyanov@phystech.edu>
+S: Maintained
+F: contrib/elf2dmp/
+
 Usermode Emulation
 ------------------
 Overall