changelog: updates for 4.5 release

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 This is a list of notable changes to Hyperscan, in reverse chronological order.
 
+## [4.5.0] 2017-06-09
+- New API feature: approximate matching using the "edit distance" extended
+  parameter. This allows the user to request all matches that are a given edit
+  distance from an exact match for a pattern.
+- Initial support for Intel(R) Advanced Vector Extensions 512 (Intel(R)
+  AVX-512), disabled by default. To enable it, pass `-DBUILD_AVX512=1` to
+  `cmake`.
+- Major compile time improvements in many subsystems, reducing compile time
+  significantly for many large pattern sets.
+- Internal reworking of literal matchers to operate on literals of at
+  most eight characters, with subsequent confirmation done in the Rose
+  interpreter. This reduces complexity and bytecode size and improves
+  performance for many pattern sets.
+- Improve performance of the FDR literal matcher front end.
+- Improve bucket assignment and other heuristics governing the FDR literal
+  matcher.
+- Improve optimisation passes that take advantage of extended parameter
+  constraints (`min_offset`, etc).
+- Introduce further lookaround specialisations to improve scanning performance.
+- Optimise Rose interpreter construction to reduce the length of programs
+  generated in some situations.
+- Remove the old "Rose" pattern decomposition analysis pass in favour of the
+  new "Violet" pass introduced in Hyperscan 4.3.0.
+- In streaming mode, allow exhaustion (where the stream can no longer produce
+  matchers) to be detected in more situations, improving scanning performance.
+- Improve parsing of control verbs (such as `(*UTF8)`) that can only occur at
+  the beginning of the pattern. Combinations of supported verbs in any order
+  are now permitted.
+- Update version of PCRE used by testing tools as a syntax and semantic
+  reference to PCRE 8.40.
+- Tuning support for Intel(R) microarchitecture code names Skylake, Skylake
+  Server, Goldmont.
+- CMake: when building a native build with a version of GCC that doesn't
+  recognise the host compiler, tune for the microarch selected by
+  `-march=native`.
+- CMake: don't fail if SQLite (which is only required to build the `hsbench`
+  tool) is not present.
+- CMake: detect libc++ directly and use that to inform the Boost version
+  requirement.
+- Bugfix for issue #51: make the fat runtime build wrapper less fragile.
+- Bugfix for issues #46, #52: use `sqlite3_errmsg()` to allow SQLite 3.6.x to
+  be used. Thanks to @EaseTheWorld for the PR.
+
 ## [4.4.1] 2017-02-28
 - Bugfixes to fix issues where stale data was being referenced in scratch
   memory. In particular this may have resulted in `hs_close_stream()`