Ignore the bot's own message when counting in example 12 (#1994)
Ignore the bot's own message when counting in example 12 (#1994)

Co-authored-by: Victoria Casasampere Fernandez <9981a0ecba6dae391996c00896deec48a3278255@gmail.com>
Co-authored-by: Constantin Nickel <1a83c16823266e90fd0dfaaadd88106e3568ce9c@gmail.com>
acdenisSK/serenity,Flat/serenity