Prepare package:analyzer 0.30.0.

pkg/kernel/README.md

 Dart Kernel
 ===========
 **Dart Kernel** is a small high-level language derived from Dart.
 It is designed for use as an intermediate format for whole-program analysis
 and transformations, and as a frontend for codegen and execution backends.
 
 The kernel language has in-memory representations in Dart and C++, and
 can be serialized as binary or text.
 
 Both the kernel language and its implementations are unstable and are under development.
 
 This package contains the Dart part of the implementation and contains:
 - A transformable IR for the kernel language
 - A frontend based on the analyzer
 - Serialization of kernel code
 
+_Note:_ The APIs in this package are in an early state; developers should be
+careful about depending on this package.
+
 Getting Kernel
 ------------
 
 Checkout the repository and run pub get:
 ```bash
 git clone https://github.com/dart-lang/kernel
 cd kernel
 pub get
 ```
 
@@ skipping 31 matching lines @@
 ```bash
 tool/regenerate_dill_files.dart --sdk <path to SDK checkout>
 pub run test
 ```
 
 
 Linking
 -------------------------
 Linking from binary files is not yet implemented.  In order to compile a whole
 program, currently everything must be compiled from source at once.