Fix cli author, bumped dependencies to modern versions, namely, urfave/cli to v3

[GwynethLlewelyn]

Fixes #29

The idea was to bump the usage of urfave/cli to v3, which requires a minor change in the CLI setup.

This PR also includes more recent versions of tableformatter which deprecated SetHeader() and replaced it with Header(). Otherwise, it's the same thing.

A few extra goodies I added:

• The * after the bucket name is a standard notation, but, these days, I like emojis best (e.g. 📁 ). The * can still be specified with a flag.
• Instead of forcing the -f to be always present, in the case that only a valid filename is passed as argument (i.e., no flags), this will also work, e.g. bolter sample-db/test-db.bolt also works

The rest are minor cosmetic changes and a few extra comments.

TODO:

• replace the interactive command line with https://github.com/chzyer/readline, so that we get bash/emacs-like completions (great for repeating commands, etc.)
• replace the pager functionality using the external more command by something in Go; the idea is to make it work universally
• rethink the code so that there is a non-interactive mode as well, which would allow scripting to use STDIN as input for a BoltDB file and STDOUT for the result