Read in from STDIN - v1.1.2

Primarily a bugfix to actually be able to read from stdin.

If a filename is provided (no -f needed now), read from that.
Otherwise, assume we're going to read from standard in.

m0ar char - v1.1.0

Add:

• -i argument - reading from stdin i.e., unix pipes
• -h argument - cli argument summary
• -6 argument - hex character set [a-f0-9]
• -p argument - common punctuation [.,?!&-'";:]
• -s argument - symbols [```~!@#$%^&_-+*/=(){}[]|\:;"'<,>.?}]

Reticulating Splines - v1.0.0

Initial release, all tests pass.
Character classes included:

• Lowercase letters [a-z]
• Uppercase letters [A-Z]
• Numbers [0-9]