release: bump project version to 2.2.1

release: update version info to 2.2.0

Release: bump version 2.0.0 -> 2.1.0

README.md: mention c++20 build option / impact

release: bump version number from 1.3.0 to 1.4.0

Release 1.3.0

Release 1.2.0

Bump version to 1.1.1

Release: bump version to 1.1.0

Merge pull request zxing-cpp#115 from marxin/add-missing-includes

Add missing includes of stdexcept header.