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Web Development with Clojure, Third Edition: update call to get-messages (page 96)

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Web Development with Clojure, Third Edition: update call to get-messages (page 96)

in fn home the call to get-message no longer requires the argument messages or this warner is seen:

WARNING: Wrong number of args (1) passed to guestbook.core/get-messages at line 99 src/cljs/guestbook/core.cljs

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