Suggestion: Short flags for --min-time and --max-time + --last LINES

[DannyBen]

How about providing short flags for these --min-time and --max-time?

Possible options:

• -n for min, -x for max
• -m for min, -x for max
• -m for min, -M for max

Also - would be nice to have a flag that shows just the last N lines. Perhaps a -l (lowercase L) or -n, so we can simply $ pt -l5