Update release notes, etc., for the 1.47.2 release #127

Job	Run time
Build and test with ASAN enabled	1m 34s
Build and test with clang	1m 9s
Cross-compile for Android (aarch64)	38s
Build and test with gcc	54s
Cross-compile for Android (armv7a)	35s
Build and test with gcc -m32	1m 9s
Cross-compile for Android (i686)	43s
Build and test on macOS	1m 37s
Build and test with UBSAN enabled	1m 20s
Cross-compile for Android (x86_64)	32s
Build mke2fs on Windows with mingw32	2m 4s
Build mke2fs on Windows with mingw64	1m 59s
	14m 14s

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