Barcodespliter

1. fix search region bug
2. support for big files (Reading large files before may overflow the memory)

please use ``pip install --upgrade barcodeSpliter`` to upgrade

[barcodeSpliter-2.0.0.tar.gz](https://github.com/atlasbioinfo/barcodeSpliter/files/7318353/barcodeSpliter-2.0.0.tar.gz)
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