Add NEWS for 5.5.1alpha
diff --git a/NEWS b/NEWS
index d271dad..37bef7f 100644
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+++ b/NEWS
@@ -2,6 +2,86 @@
XZ Utils Release Notes
======================
+5.5.1alpha (2024-01-26)
+
+ * Added a new filter for RISC-V binaries. The filter can be used
+ for 32-bit and 64-bit binaries with either little or big
+ endianness. In liblzma, the Filter ID is LZMA_FILTER_RISCV (0x0B)
+ and the xz option is --riscv. liblzma filter string syntax
+ recognizes this filter as "riscv".
+
+ * liblzma:
+
+ - Added lzma_mt_block_size() to recommend a Block size for
+ multithreaded encoding
+
+ - Added CLMUL-based CRC32 on x86-64 and E2K with runtime
+ processor detection. Similar to CRC64, on 32-bit x86 it
+ isn't available unless --disable-assembler is used.
+
+ - Implemented GNU indirect function (IFUNC) as a runtime
+ function dispatching method for CRC32 and CRC64 fast
+ implementations on x86. Only GNU/Linux (glibc) and FreeBSD
+ builds will use IFUNC, unless --enable-ifunc is specified to
+ configure.
+
+ - Added definitions of mask values like
+ LZMA_INDEX_CHECK_MASK_CRC32 to <lzma/index.h>.
+
+ - The XZ logo is now included in the Doxygen generated
+ documentation. It is licensed under Creative Commons
+ Attribution-ShareAlike 4.0.
+
+ * xz:
+
+ - Multithreaded mode is now the default. This improves
+ compression speed and creates .xz files that can be
+ decompressed multithreaded at the cost of increased memory
+ usage and slightly worse compression ratio.
+
+ - Added new command line option --filters to set the filter
+ chain using liblzma filter string syntax.
+
+ - Added new command line options --filters1 ... --filters9 to
+ set additional filter chains using liblzma filter string
+ syntax. The --block-list option now allows specifying filter
+ chains that were set using these new options.
+
+ - Added support for Linux Landlock as a sandboxing method.
+
+ - xzdec now supports pledge(2), Capsicum, and Linux Landlock as
+ sandboxing methods.
+
+ - Progress indicator time stats remain accurate after pausing
+ xz with SIGTSTP.
+
+ - Ported xz and xzdec to Windows MSVC. Visual Studio 2015 or
+ later is required.
+
+ * CMake Build:
+
+ - Supports pledge(2), Capsicum, and Linux Landlock sandboxing
+ methods.
+
+ - Replacement functions for getopt_long() are used on platforms
+ that do not have it.
+
+ * Enabled unaligned access by default on PowerPC64LE and on RISC-V
+ targets that define __riscv_misaligned_fast.
+
+ * Tests:
+
+ - Added two new fuzz targets to OSS-Fuzz.
+
+ - Implemented Continuous Integration (CI) testing using
+ GitHub Actions.
+
+ * Changed quoting style from `...' to '...' in all messages,
+ scripts, and documentation.
+
+ * Added basic Codespell support to help catch typo errors.
+
+
5.4.6 (2024-01-26)
* Fixed a bug involving internal function pointers in liblzma not
