Tools usage is broken for conventional syntax

While reviewing doc changes for #133, I noticed that -Tcljwatson usage is somewhat broken. For example, the README suggests: ``` clojure -Tclj-watson scan :deps-edn-path '"deps.edn"' :output '"stdout"' # or: clojure -Tclj-watson scan '{:deps-edn-path "deps.edn" :output "stdout"}' ``` Both these variants result in: ``` * ERROR: Invalid value for argument: Specified file not found :p, :deps-edn-path <file> Path of deps.edn file to scan [*required*] ``` But these work fine: ``` clojure -Tclj-watson scan :deps-edn-path deps.edn :output stdout # or: clojure -Tclj-watson scan '{:deps-edn-path deps.edn :output stdout}' ``` I don't typically use clojure tools because I find the command-line syntax too finicky for me. That said, I'm the one who broke this a while back, so I shall fix it. The coercion I applied means we can specify `deps.edn` instead of the conventional syntax of `'"deps.edn"'`, but I also seem to have broken the conventional syntax.