release notes for version 1.4 #735

Job	Run time
build-macos-brew-Qt6 (clang-9)	2m 58s
build-macos-brew (clang-9)	2m 37s
build-linux (gcc-9)	7m 45s
build-macos-no-brew (clang-9)	4m 39s
build-macos-no-brew-Qt6 (clang-9)	5m 12s
build-linux-Qt6 (gcc-9)	8m 2s
build-windows-mingw (5.15.*)	8m 53s
build-windows-mingw-Qt6 (6.3.0, qtmultimedia qt5compat)	11m 11s
build-windows-vs (5.15.*)	8m 24s
build-windows-vs-Qt6 (6.3.0, qtmultimedia qt5compat)	13m 16s
	1h 12m 57s

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