Fix checksum calcuation #5
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Thank you for creating the library. I'm using it for making warehouse labels, as it's compact, and produces razor sharp barcodes when printed on a label printer.
This PR fixes the chcksum calculation, as one of the additions was incorrectly made after the modulo operation. Instead, I propose using 104 (start code B) as an init number, which effectively shifts the result by 1.
Fixes #2 #3