format changelog

CHANGELOG.md

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 # Changelog
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 All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## 0.1.6 - unreleased
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 ### Changed
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 - Require rust 1.73
 
 ## [0.1.5] - 2023-08-29
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 ### Fixed
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 - Fixed compilation of backtraces on recent nightly.
 - Tests parse ffmpeg version "6.0" as "6.0.0".
 
 ## [0.1.4] - 2023-05-25
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 ### Fixed
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 - Fixed a bug in which specification was not followed. Reported by @wrv.
   Specifically, "nal_ref_idc shall not be equal to 0 for NAL units with
   nal_unit_type equal to 5".
 
 ### Added
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 - `no_std` support
 - implement `source()` method for `Error`
 
 ## [0.1.3] - 2023-03-30
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 ### Added
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 - Added `NalUnit::to_nal_unit()` method to save "naked" NAL units without start
   prefix framing.
 
 ## [0.1.2] - 2022-11-20
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 ### Added
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 - Use memchr crate for SIMD-accelerated searching and thus improve performance.
 - Tests requiring ffmpeg will fail with an explicit error if ffmpeg is too old.
   (Version 5.1 or higher is required for high bit-depth data.)
 
 ## [0.1.1] - 2022-11-19
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 ### Added
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 - Added crate metadata
 
 ## [0.1.0] - 2022-11-19
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 ### Added
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 - Initial release
 
 [0.1.5]: https://github.com/strawlab/less-avc/releases/tag/0.1.5