Use exec in finish script (#44)

example/rootfs/etc/services.d/example/finish

@@ -6,7 +6,7 @@
 
 if [[ "$1" -ne 0 ]] && [[ "$1" -ne 256 ]]; then
   bashio::log.warning "Halt add-on"
-  /run/s6/basedir/bin/halt
+  exec /run/s6/basedir/bin/halt
 fi
 
 bashio::log.info "Service restart after closing"