Add 3.0.0-alpha-3 release to CHANGES.txt
diff --git a/CHANGES.txt b/CHANGES.txt
index ac42aa5..7d73201 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,3 +1,102 @@
+2015-05-25 version 3.0.0-alpha-3 (Objective-C/C#):
+ General
+ * Introduced two new language implementations (Objective-C, C#) to proto3.
+ * Disallowed "optional" keyword in proto3 syntax.
+ * Removed groups fields in proto3 syntax.
+ * Changed repeated primitive fields to use packed serialization by default in
+ proto3 (implemented for C++, Java, Python in this release). The user can
+ still disable packed serialization by setting packed to false for now.
+ * Added well-known type protos (any.proto, empty.proto, timestamp.proto,
+ duration.proto, etc.). Users can import and use these protos just like
+ regular proto files. Addtional runtime support will be added for them in
+ future releases (in the form of utility helper functions, or having them
+ replaced by language specific types in generated code).
+ * Added a "reserved" keyword in both proto2 and proto3 syntax. User can use
+ this keyword to declare reserved field numbers and names to prevent them
+ from being reused by other fields in the same message.
+
+ To reserve field numbers, add a reserved declaration in your message:
+
+ message TestMessage {
+ reserved 2, 15, 9 to 11, 3;
+ }
+
+ This reserves field numbers 2, 3, 9, 10, 11 and 15. If a user uses any of
+ these as field numbers, the protocol buffer compiler will report an error.
+
+ Field names can also be reserved:
+
+ message TestMessage {
+ reserved "foo", "bar";
+ }
+
+ * Various bug fixes since 3.0.0-alpha-2
+
+ Objective-C
+ Objective-C includes a code generator and a native objective-c runtime
+ library. By adding “--objc_out” to protoc, the code generator will generate
+ a header(*.pbobjc.h) and an implementation file(*.pbobjc.m) for each proto
+ file.
+
+ In this first release, the generated interface provides: enums, messages,
+ field support(single, repeated, map, oneof), proto2 and proto3 syntax
+ support, parsing and serialization. It’s compatible with ARC and non-ARC
+ usage. Besides, user can also access it via the swift bridging header.
+
+ See objectivec/README.md for details.
+
+ C#
+ * C# protobufs are based on project
+ https://github.com/jskeet/protobuf-csharp-port. The original project was
+ frozen and all the new development will happen here.
+ * Codegen plugin for C# was completely rewritten to C++ and is now an
+ intergral part of protoc.
+ * Some refactorings and cleanup has been applied to the C# runtime library.
+ * Only proto2 is supported in C# at the moment, proto3 support is in
+ progress and will likely bring significant breaking changes to the API.
+
+ See csharp/README.md for details.
+
+ C++
+ * Added runtime support for Any type. To use Any in your proto file, first
+ import the definition of Any:
+
+ // foo.proto
+ import "google/protobuf/any.proto";
+ message Foo {
+ google.protobuf.Any any_field = 1;
+ }
+ message Bar {
+ int32 value = 1;
+ }
+
+ Then in C++ you can access the Any field using PackFrom()/UnpackTo()
+ methods:
+
+ Foo foo;
+ Bar bar = ...;
+ foo.mutable_any_field()->PackFrom(bar);
+ ...
+ if (foo.any_field().IsType<Bar>()) {
+ foo.any_field().UnpackTo(&bar);
+ ...
+ }
+ * In text format, entries of a map field will be sorted by key.
+
+ Java
+ * Continued optimizations on the lite runtime to improve performance for
+ Android.
+
+ Python
+ * Added map support.
+ - maps now have a dict-like interface (msg.map_field[key] = value)
+ - existing code that modifies maps via the repeated field interface
+ will need to be updated.
+
+ Ruby
+ * Improvements to RepeatedField's emulation of the Ruby Array API.
+ * Various speedups and internal cleanups.
+
2015-02-26 version 3.0.0-alpha-2 (Python/Ruby/JavaNano):
General
* Introduced three new language implementations (Ruby, JavaNano, and