added ease of use feature of _what_is_ function - suppose the user gave a long arg, say `--input`, we don't have to call _what_is_('input') to get the value. We can simple call _what_is with the corresponding shortarg, say `-i`. -> _what_is_('i'). - vice versa
1.5.1
- do not use v1.5 -> version has been yanked. - fixed a major bug.