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changelog: updates for 4.3 release

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CHANGELOG.md
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This is a list of notable changes to Hyperscan, in reverse chronological order. This is a list of notable changes to Hyperscan, in reverse chronological order.
## [4.3.0] 2016-08-24
- Introduce a new analysis pass ("Violet") used for decomposition of patterns
into literals and smaller engines.
- Introduce a new container engine ("Tamarama") for infix and suffix engines
that can be proven to run exclusively of one another. This reduces stream
state for pattern sets with many such engines.
- Introduce a new shuffle-based DFA engine ("Sheng"). This improves scanning
performance for pattern sets where small engines are generated.
- Improve the analysis used to extract extra mask information from short
literals.
- Reduced compile time spent in equivalence class analysis.
- Build: frame pointers are now only omitted for 32-bit release builds.
- Build: Workaround for C++ issues reported on FreeBSD/libc++ platforms.
(github issue #27)
- Simplify the LimEx NFA with a unified "variable shift" model, which reduces
the number of different NFA code paths to one per model size.
- Allow some anchored prefixes that may squash the literal to which they are
attached to run eagerly. This improves scanning performance for some
patterns.
- Simplify and improve EOD ("end of data") matching, using the interpreter for
all operations.
- Elide unnecessary instructions in the Rose interpreter at compile time.
- Reduce the number of inlined instantiations of the Rose interpreter in order
to reduce instruction cache pressure.
- Small improvements to literal matcher acceleration.
- Parser: ignore `\E` metacharacters that are not preceded by `\Q`. This
conforms to PCRE's behaviour, rather than returning a compile error.
- Check for misaligned memory when allocating an error structure in Hyperscan's
compile path and return an appropriate error if detected.
## [4.2.0] 2016-05-31 ## [4.2.0] 2016-05-31
- Introduce an interpreter for many complex actions to replace the use of - Introduce an interpreter for many complex actions to replace the use of
internal reports within the core of Hyperscan (the "Rose" engine). This internal reports within the core of Hyperscan (the "Rose" engine). This