v2.0: Backend changes (aiogram 2.x -> 3.x)

Nothing has changed for you, dear players, but the bot itself got a huge upgrade: we've switched from aiogram 2.x to 3.x. And while aiogram 3.x is still in beta, the framework is rather stable to be used in production, and introduces lots of cool things to try.

No data has been lost, and all your stats are kept. By the way, more than 4000 games have been played already. Thank you!

For dear developers: be warned, this release has backwards-incompatible changes for config file, so you need to check env_dist file and move your old settings to the new .env file. Also, we've added support for local Bot API in case you want to run the bot under dynamic IP address on webhooks.

v1.7: Statistically, people like you are awesome!

Introducing personal statistics! Use the new /stats command and see how many games you played, grouped by field size. Also, see your winrate and tell friends who's the best bombsweeper in town!

v1.6: Non-Stop-Bomb!

With this release, you can quickly start a new game after you win or lose. Even better, there is a shortcut to keep the current game mode. Neat!

v1.5: Open multiple cells at once

With this release, you can open the whole block of cells if you click of the unoccupied one. No more "click all those zeros" routine!
Speaking about zeros... they were replaced with an empty symbol to make game field less cluttered.

v1.4: No more "death on first click"

Now the field is only generated after your first click.
In addition to that, you don't have to put all flags on the field. As soon as all non-bombs squares are open, you win!