build: bump aoc-client minor version

build: set aoc-client version dependency

feat: add PuzzlePart conversion from i64

feat: add command to show advent calendar

build: bump release version

feat: minor improvements to private leaderboard

* show leaderboard of past years without providing a day
* report unaccessible leaderboard on http 302 redirect
* on any unexpected http reponse, warn that cookie may be expired

feat: warn when session cookie may be expired

build: bump minor version

feat: minor changes to command line options

- read now only shows puzzle statement on the terminal (it no longer
  saves it to file)
- download now saves both input and description to files
- choose what to download with  --input-only and --description-only

feat: send user-agent header in http requests