Update "Parsing Command-Line Arguments" to use tools.cli 0.3.x and parse-opts

[etoews]

Update https://github.com/clojure-cookbook/clojure-cookbook/blob/master/03_general-computing/3-07_parse-command-line-arguments.asciidoc to use tools.cli 0.3.x and parse-opts.

[avescodes]

I'd love to see this, myself. The 0.3.x transition changed a good deal though, any chance you (or others) wanted to lend a hand updating the recipe?

[metric-space]

@rkneufeld could you review #451 please?, this needs to be in the cookbook because cli usage ispretty much legacy usage at this point.