Add changelog for v3.0.0-beta-2.

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Change-Id: Id383944dd3c999ad1008345ef34c9bdae24abc7c
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Feng Xiao 2015-12-21 14:36:30 -08:00
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2015-08-26 version 3.0.0-beta-1 (C++/Java/Python/Ruby/Nano/Objective-C/C#/JavaSript)
General
* Intorduced a new language implementaion: JavaScript.
* Added a new field option "json_name". By default proto field names are
converted to "lowerCamelCase" in proto3 JSON format. This option can be
used to override this behavior and specify a different JSON name for the
field.
* Added conformance tests to ensure implementations are following proto3 JSON
specification.
C++ (Beta)
* Various bug fixes and improvements to the JSON support utility:
- Duplicate map keys in JSON are now rejected (i.e., translation will
fail).
- Fixed wire-format for google.protobuf.Value/ListValue.
- Fixed precision loss when converting google.protobuf.Timestamp.
- Fixed a bug when parsing invalid UTF-8 code points.
- Fixed a memory leak.
- Reduced call stack usage.
Java (Beta)
* Cleaned up some unused methods on CodedOutputStream.
* Presized lists for packed fields during parsing in the lite runtime to
reduce allocations and improve performance.
* Improved the performance of unknown fields in the lite runtime.
* Introduced UnsafeByteStrings to support zero-copy ByteString creation.
* Various bug fixes and improvements to the JSON support utility:
- Fixed a thread-safety bug.
- Added a new option “preservingProtoFieldNames” to JsonFormat.
- Added a new option “includingDefaultValueFields” to JsonFormat.
- Updated the JSON utility to comply with proto3 JSON specification.
Python (Beta)
* Added proto3 JSON format utility. It includes support for all field types
and a few well-known types except for Any and Struct.
* Added runtime support for Any, Timestamp, Duration and FieldMask.
* [ ] is now accepted for repeated scalar fields in text format parser.
Objective-C (Beta)
* Various bug-fixes and code tweaks to pass more strict compiler warnings.
* Now has conformance test coverage and is passing all tests.
C# (Beta)
* Various bug-fixes.
* Code generation: Files generated in directories based on namespace.
* Code generation: Include comments from .proto files in XML doc
comments (naively)
* Code generation: Change organization/naming of "reflection class" (access
to file descriptor)
* Code generation and library: Add Parser property to MessageDescriptor,
and introduce a non-generic parser type.
* Library: Added TypeRegistry to support JSON parsing/formatting of Any.
* Library: Added Any.Pack/Unpack support.
* Library: Implemented JSON parsing.
Javascript (Alpha)
* Added proto3 support for JavaScript. The runtime is written in pure
JavaScript and works in browsers and in Node.js. To generate JavaScript
code for your proto, invoke protoc with "--js_out". See js/README.md
for more build instructions.
2015-08-26 version 3.0.0-beta-1 (C++/Java/Python/Ruby/Nano/Objective-C/C#)
About Beta
* This is the first beta release of protobuf v3.0.0. Not all languages