Exception on Numeric QR Code

[NJBS]

268 specifically seems to cause an array access exception when trying to create a version 1 numerically encoded with high error correction qr code. The qr code should be able to hold at least 17 digits if numeric so I don't think the version number is the issue here.

> encode (fromJust $ version 1) H Numeric "267"
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> encode (fromJust $ version 1) H Numeric "268"
Just *** Exception: (Array.!): undefined array element
> encode (fromJust $ version 1) H Numeric "269"
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