CHANGELOG.md: add with backfill

Not going to use sections at this time, as it's not always clear what
category something belongs to.

See: http://keepachangelog.com/

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CHANGELOG.md

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+# Change Log
+
+## [Unreleased]
+
+* **API** Support inferring [Sequence][doc:Sequence.count] and
+  [Blob][doc:Blob.length] from available data.
+* **API** Define return value for [Layout.encode][doc:Layout.encode] so
+  we know how much was written.
+* **API** Change name of [Sequence][doc:Sequence] property
+  `elementLayout` (from `element_layout`) and [Union][doc:Union]
+  property `defaultLayout` (from (`default layout`) for coding standard
+  conformance.
+* Convert to [Google coding style][npm:jscs].
+
+## [0.8.0] - 2015-11-29
+
+* [Add][issue#13] [64-bit integers][doc:NearInt64].
+
+## [0.7.1] - 2015-11-23
+
+* Stop publishing emacs backup files to npm.
+
+## [0.7.0] - 2015-11-23
+
+* [Fix][doc:patchIssue3992] [bug in Buffer.writeInt][node:issue#3992].
+* **API** Support [variable lengths][doc:Layout.getSpan] in
+  unions.
+* **API** Add [zero-width constants][doc:Constant].
+* **API** Add function to infer [union variant for object][doc:Union.getSourceVariant].
+* **API** Rework how [union discriminators][doc:UnionDiscriminator] are
+  defined.
+
+## [0.6.0] - 2015-11-21
+
+* **API** [Support][issue#11] variable lengths in
+  [Blob][doc:Blob.length] and [Sequence][doc:Sequence.count].
+* **API** Add [NUL-terminated C strings][doc:CString].
+* **API** Add API to access layout [span][doc:Layout.span]
+* **API** Leave data associated with unnamed properties unchanged in
+  [Structure][doc:structure] and [BitStructure][doc:BitStructure] regions
+  (formerly was zeroed on encode).
+* Add [offset layout][doc:OffsetLayout] support.
+* **API** Eliminate failed support for [anonymous containers][issue#8].
+
+## [0.5.0] - 2015-11-20
+
+* Add [factories for various layouts][issue#10].
+* Integrate [travis support][ci:travis].
+* Integrate [coverage testing][ci:coveralls] using [Istanbul][npm:istanbul].
+
+## [0.4.0] - 2015-11-19
+
+* [Support][issue#9] [data blobs][doc:Blob].
+* Add tests for support of [anonymous containers][issue#8] *feature
+  ultimately rejected*.
+* [Allow][issue#7] [external discriminators][doc:UnionDiscriminator] for
+  unions.
+* [Respect union property names][issue#6].
+
+## [0.3.0] - 2015-11-07
+
+* [Add support][issue#5] for [bit fields][doc:BitField].
+* Various [corrections and enhancements in examples][issue#4].
+
+## [0.2.0] - 2015-10-25
+
+* Add [fromArray helper][issue#3] to simplify construction from argument
+  list.
+* Document [destination parameter to decode][issue#2].
+* Allow [user-defined name for union discriminators][issue#1].
+
+## 0.1.0 - 2015-10-25
+
+* Initial release.
+
+[Unreleased]: https://github.com/pabigot/buffer-layout/compare/v0.8.0...next
+[0.8.0]: https://github.com/pabigot/buffer-layout/compare/v0.7.0...v0.8.0
+[0.7.1]: https://github.com/pabigot/buffer-layout/compare/v0.7.0...v0.7.1
+[0.7.0]: https://github.com/pabigot/buffer-layout/compare/v0.6.0...v0.7.0
+[0.6.0]: https://github.com/pabigot/buffer-layout/compare/v0.5.0...v0.6.0
+[0.5.0]: https://github.com/pabigot/buffer-layout/compare/v0.4.0...v0.5.0
+[0.4.0]: https://github.com/pabigot/buffer-layout/compare/v0.3.0...v0.4.0
+[0.3.0]: https://github.com/pabigot/buffer-layout/compare/v0.2.0...v0.3.0
+[0.2.0]: https://github.com/pabigot/buffer-layout/compare/v0.1.0...v0.2.0
+[doc:BitField]: http://pabigot.github.io/buffer-layout/module-Layout-BitField.html
+[doc:BitStructure]: http://pabigot.github.io/buffer-layout/module-Layout-BitStructure.html
+[doc:Blob]: http://pabigot.github.io/buffer-layout/module-Layout-Blob.html
+[doc:Blob.length]: http://pabigot.github.io/buffer-layout/module-Layout-Blob.html#length
+[doc:Constant]: http://pabigot.github.io/buffer-layout/module-Layout-Constant.html
+[doc:CString]: http://pabigot.github.io/buffer-layout/module-Layout-CString.html
+[doc:Layout.encode]: http://pabigot.github.io/buffer-layout/module-Layout-Layout.html#encode
+[doc:Layout.getSpan]: http://pabigot.github.io/buffer-layout/module-Layout-Layout.html#getSpan
+[doc:Layout.span]: http://pabigot.github.io/buffer-layout/module-Layout-Layout.html#span
+[doc:NearInt64]: http://pabigot.github.io/buffer-layout/module-Layout-NearInt64.html
+[doc:OffsetLayout]: http://pabigot.github.io/buffer-layout/module-Layout-OffsetLayout.html
+[doc:patchIssue3992]: http://pabigot.github.io/buffer-layout/module-patchIssue3992.html
+[doc:Union]: http://pabigot.github.io/buffer-layout/module-Layout-Union.html
+[doc:Union.getSourceVariant]: http://pabigot.github.io/buffer-layout/module-Layout-Union.html#getSourceVariant
+[doc:UnionDiscriminator]: http://pabigot.github.io/buffer-layout/module-Layout-UnionDiscriminator.html
+[doc:Sequence]: http://pabigot.github.io/buffer-layout/module-Layout-Sequence.html
+[doc:Sequence.count]: http://pabigot.github.io/buffer-layout/module-Layout-Sequence.html#count
+[doc:Structure]: http://pabigot.github.io/buffer-layout/module-Layout-Structure.html
+[issue#1]: https://github.com/pabigot/buffer-layout/issues/1
+[issue#2]: https://github.com/pabigot/buffer-layout/issues/2
+[issue#3]: https://github.com/pabigot/buffer-layout/issues/3
+[issue#4]: https://github.com/pabigot/buffer-layout/issues/4
+[issue#5]: https://github.com/pabigot/buffer-layout/issues/5
+[issue#6]: https://github.com/pabigot/buffer-layout/issues/6
+[issue#7]: https://github.com/pabigot/buffer-layout/issues/7
+[issue#8]: https://github.com/pabigot/buffer-layout/issues/8
+[issue#9]: https://github.com/pabigot/buffer-layout/issues/9
+[issue#10]: https://github.com/pabigot/buffer-layout/issues/10
+[issue#11]: https://github.com/pabigot/buffer-layout/issues/11
+[issue#12]: https://github.com/pabigot/buffer-layout/issues/12
+[issue#13]: https://github.com/pabigot/buffer-layout/issues/13
+[ci:travis]: https://travis-ci.org/pabigot/buffer-layout
+[ci:coveralls]: https://coveralls.io/github/pabigot/buffer-layout
+[node:issue#3992]: https://github.com/nodejs/node/issues/3992
+[npm:istanbul]: https://www.npmjs.com/package/istanbul
+[npm:jscs]: https://www.npmjs.com/package/jscs
+
+<!---
+# Local Variables:
+# mode:markdown
+# End:
+-->