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

release: bump version number from 1.3.0 to 1.4.0

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.

Fix wrong description for passing flags to cmake

Fixes zxing-cpp#78 Add configuration for build with appveyor + bump v…

…ersion to 1.0.6

Bump version to 1.0.5

Bump version to 1.0.4