Add middleware descriptor to pretty-middleware
#29
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This commit resolves issue #28. To review, at the moment opening a REPL
logs the following warning: "[WARNING] No nREPL middleware descriptor in
metadata of #'io.aviso.nrepl/pretty-middleware, see
clojure.tools.middleware/set-descriptor!"
In point of fact, they want you to look at
clojure.tools.nrepl.middleware/set-descriptor!
At any rate, this commit sets descriptor metadata on
io.aviso.nrepl/pretty-middleware
so the error stops being thrown.