changelog: updates for 4.7.0 release

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Matthew Barr 2018-01-24 10:05:09 +11:00 committed by Xiang Wang
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This is a list of notable changes to Hyperscan, in reverse chronological order.
## [4.7.0] 2018-01-24
- Introduced hscollider pattern testing tool, for validating Hyperscan match
behaviour against PCRE.
- Introduced hscheck pattern compilation tool.
- Introduced hsdump development tool for producing information about Hyperscan
pattern compilation.
- New API feature: extended approximate matching support for Hamming distance.
- Bugfix for issue #69: Force C++ linkage in Xcode.
- Bugfix for issue #73: More documentation for `hs_close_stream()`.
- Bugfix for issue #78: Fix for fat runtime initialisation when used as a
shared library.
## [4.6.0] 2017-09-22
- New API feature: stream state compression. This allows the user to compress
and restore state for streams to reduce memory usage.