send-request with RequestType::Get tries to use += for string concat

[timo]

https://github.com/GildedHonour/TelegramBot/blob/master/lib/Telegram.pm6#L32

this is surely wrong, because + doesn't concatenate strings, but there's probably also some kind of separator character missing, so that values and following keys don't run together?

[heince]

i'm testing with offset and limit, got same issue when sending request with params, have sent the pull request on this.