Reads text from stdin, writes leetspeek to stdout
R34d5 73x7 fr0m 57d1n, wr1735 13375p33k 70 57d0u7
$ npm i -g leetspeek
$ echo 'I am the leet haxor' | leetspeek
1 4m 7h3 1337 h4x0r
$ leetspeek foo, bar and baz friends folife
f00, 84r 4nd 84z fr13nd5 f011f3