Update change log
diff --git a/CHANGES.txt b/CHANGES.txt
index ccc8ff9..ddca905 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,3 +1,131 @@
+2017-08-01 version 3.4.0 (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)
+ Planned Future Changes
+ * There are some changes that are not included in this release but are planned
+ for the near future
+ - Preserve unknown fields in proto3: We are going to bring unknown fields
+ back into proto3. In this release, some languages start to support
+ preserving unknown fields in proto3, controlled by flags/options. Some
+ languages also introduce explict APIs to drop unknown fields for
+ migration. Please read the change log sections by languages for details.
+ For general timeline and plan:
+
+ https://docs.google.com/document/d/1KMRX-G91Aa-Y2FkEaHeeviLRRNblgIahbsk4wA14gRk/view
+
+ For issues and discussions:
+
+ https://github.com/google/protobuf/issues/272
+
+ - Make C++ implementation C++11 only: we plan to require C++11 to build
+ protobuf code starting from 3.5.0 or 3.6.0 release, after unknown fields
+ semantic changes are finished. Please join this
+ github issue:
+
+ https://github.com/google/protobuf/issues/2780
+
+ to provide your feedback.
+
+ General
+ * Extension ranges now accept options and are customizable.
+ * "reserve" keyword now supports “max” in field number ranges,
+ e.g. reserve 1000 to max;
+
+ C++
+ * Proto3 messages are now able to preserve unknown fields. The default
+ behavior is still to drop unknowns, which will be flipped in a future
+ release. If you rely on unknowns fields being dropped. Please use
+ Messgae::DiscardUnknownFields() explicitly.
+ * Packable proto3 fields are now packed by default in serialization.
+ * Following C++11 features are introduced when C++11 is available:
+ - move-constructor and move-assignment are introduced to messages
+ - Repeated fields constructor now takes std::initializer_list
+ - rvalue setters are introduced for string fields
+ * Experimental Table-Driven parsing and serialization available to test. To
+ enable it, pass in table_driven_parsing table_driven_serialization protoc
+ generator flags for C++
+
+ $ protoc --cpp_out=table_driven_parsing,table_driven_serialization:./ \
+ test.proto
+ * lite generator parameter supported by the generator. Once set, all generated
+ files, use lite runtime regardless of the optimizer_for setting in the
+ .proto file.
+ * Various optimizations to make C++ code more performant on PowerPC platform
+ * Fixed maps data corruption when the maps are modified by both reflection API
+ and generated API.
+ * Deterministic serialization on maps reflection now uses stable sort.
+ * file() accessors are introduced to various *Descriptor classes to make
+ writing template function easier.
+ * ByteSize() and SpaceUsed() are deprecated.Use ByteSizeLong() and
+ SpaceUsedLong() instead
+ * Consistent hash function is used for maps in DEBUG and NDEBUG build.
+ * "using namespace std" is removed from stubs/common.h
+ * Various performance optimizations and bug fixes
+
+ Java
+ * Introduced new parser API DiscardUnknownFieldsParser in preparation of
+ proto3 unknown fields preservation change. Users who want to drop unknown
+ fields should migrate to use this new parser API. For example:
+
+ Parser<Foo> parser = DiscardUnknownFieldsParser.wrap(Foo.parser());
+ Foo foo = parser.parseFrom(input);
+
+ * Introduced new TextFormat API printUnicodeFieldValue() that prints field
+ value without escaping unicode characters.
+ * Added Durations.compare(Duration, Duration) and
+ Timestamps.compare(Timestamp, Timestamp).
+ * JsonFormat now accepts base64url encoded bytes fields.
+ * Optimized CodedInputStream to do less copies when parsing large bytes
+ fields.
+ * Optimized TextFormat to allocate less memory when printing.
+
+ Python
+ * SerializeToString API is changed to SerializeToString(self, **kwargs),
+ deterministic parameter is accepted for deterministic serialization.
+ * Added sort_keys parameter in json format to make the output deterministic.
+ * Added indent parameter in json format.
+ * Added extension support in json format.
+ * Added __repr__ support for repeated field in cpp implementation.
+ * Added file in FieldDescriptor.
+ * Added pretty-print filter to text format.
+ * Services and method descriptors are always printed even if generic_service
+ option is turned off.
+
+ PHP
+ * Support PHP generic services. Specify file option php_generic_service=true
+ to enable generating service interface.
+ * Message, repeated and map fields setters take value instead of reference.
+ * Added map iterator in c extension.
+ * Support json encode/decode.
+ * Added more type info in getter/setter phpdoc
+ * Fixed the problem that c extension and php implementation cannot be used
+ together.
+ * Added file option php_namespace to use custom php namespace instead of
+ package.
+ * Added fluent setter.
+ * Added descriptor API in runtime for custom encode/decode.
+ * Various bug fixes.
+
+ Objective-C
+ * Fix for GPBExtensionRegistry copying and add tests.
+ * Optimize GPBDictionary.m codegen to reduce size of overall library by 46K
+ per architecture.
+ * Fix some cases of reading of 64bit map values.
+ * Properly error on a tag with field number zero.
+ * Preserve unknown fields in proto3 syntax files.
+ * Document the exceptions on some of the writing apis.
+
+ C#
+ * Implemented IReadOnlyDictionary<K,V> in MapField<K,V>
+ * Added TryUnpack method for Any message in addition to Unpack.
+ * Converted C# projects to MSBuild (csproj) format.
+
+ Ruby
+ * Several bug fixes.
+
+ Javascript
+ * Added support of field option js_type. Now one can specify the JS type of a
+ 64-bit integer field to be string in the generated code by adding option
+ [jstype = JS_STRING] on the field.
+
2017-04-05 version 3.3.0 (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)
Planned Future Changes
* There are some changes that are not included in this release but are
