Add changelog for 3.0.0-alpha2 release.
Change-Id: I4cbb3374e351c31611de472c7d5d78e4ce2b0f3b
diff --git a/CHANGES.txt b/CHANGES.txt
index 0d4ce0e..02c964c 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,3 +1,43 @@
+2015-2-22 version 3.0.0-alpha-2 (Ruby/JavaNano):
+ General
+ * Introduced two new language implementations (Ruby and JavaNano) to proto3.
+ * Various bug fixes since 3.0.0-alpha-1
+
+ Ruby:
+ TODO(cfallin): Add descriptions here.
+
+ JavaNano:
+ JavaNano is a special code generator and runtime library designed especially
+ for resource-restricted systems, like Android. It is very resource-friendly
+ in both the amount of code and the runtime overhead. Here is an an overview
+ of JavaNano features compared with the official Java protobuf:
+
+ - No descriptors or message builders.
+ - All messages are mutable; fields are public Java fields.
+ - For optional fields only, encapsulation behind setter/getter/hazzer/
+ clearer functions is opt-in, which provide proper 'has' state support.
+ - For proto2, if not opted in, has state (field presence) is not available.
+ Serialization outputs all fields not equal to their defaults.
+ The behavior is consistent with proto3 semantics.
+ - Required fields (proto2 only) are always serialized.
+ - Enum constants are integers; protection against invalid values only
+ when parsing from the wire.
+ - Enum constants can be generated into container interfaces bearing
+ the enum's name (so the referencing code is in Java style).
+ - CodedInputByteBufferNano can only take byte[] (not InputStream).
+ - Similarly CodedOutputByteBufferNano can only write to byte[].
+ - Repeated fields are in arrays, not ArrayList or Vector. Null array
+ elements are allowed and silently ignored.
+ - Full support for serializing/deserializing repeated packed fields.
+ - Support extensions (in proto2).
+ - Unset messages/groups are null, not an immutable empty default
+ instance.
+ - toByteArray(...) and mergeFrom(...) are now static functions of
+ MessageNano.
+ - The 'bytes' type translates to the Java type byte[].
+
+ See javanano/README.txt for details.
+
2014-12-01 version 3.0.0-alpha-1 (C++/Java):
General