Lemures Lemniscati

Fix MAX_DATA_SIZE, in case 16 symbols are needed by structured appending

1

This pull-request should fix #185

Copyright year is still old

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I guess it should be `2006-2020` rather than `2006-2017`. ``` $ qrencode --version qrencode version 4.1.1 Copyright (C) 2006-2017 Kentaro Fukuchi ``` It is coded at https://github.com/fukuchi/libqrencode/blob/v4.1.1/qrenc.c#L110

Fix `msys2.yml`, so that `msys2-build` will work

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This is just a test. Sorry for bothering.

This PR includes #177, but its principal change is the last commit.