Added drop range flag and docker support

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Drop range flag can be used like so:

./sniper -u 599 -d "1726589098-1726744174"

Running MCsniperGO using docker:

git clone https://github.com/Kqzz/MCsniperGO
cd MCsniperGO
docker build -t sniper .
docker run -d --rm --name sniper -v $PWD/ms.txt:/app/ms.txt sniper -u 599 -d "1726589098-1726744174"