guess output format based on output file extension
check for empty output file
default to .txt if no file extension provided
change default output format back to txt
add tests
update man page
fix default output format
directly return output dumper
use keys from dumpers in key error message
fix man pages
prevent output format from being overridden
use first dumper key as default format
update messages and formatting
update help message for format argument
specify list type in InvalidOutputFormat exception
make default output format more apparent
update messages
* feat: replace latitude and longitude with one argument alone: --position
* feat: add support for Plus Code
From Wikipedia: “The Open Location Code is a geocode system for
identifying an area anywhere on the Earth.”
A Plus Code has a the form of small alphanumerical codes like: `9F25J3H5+M8`
* docs: update the manpage