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Merge pull request #2497 from ethereum/changelog

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### 0.4.12 (unreleased)
Features:
* Assembly: renamed ``SHA3`` to ``KECCAK256``.
* Assembly: Display auxiliary data in the assembly output.
* Assembly: Add ``CREATE2`` (EIP86), ``STATICCALL`` (EIP214), ``RETURNDATASIZE`` and ``RETURNDATACOPY`` (EIP211) instructions.
* Assembly: Display auxiliary data in the assembly output.
* Assembly: Renamed ``SHA3`` to ``KECCAK256``.
* AST: export all attributes to JSON format.
* Type Checker: Warn about type inference from literal numbers.
* C API (``jsonCompiler``): Use the Standard JSON I/O internally.
* Code Generator: Added the Whiskers template system.
* Inline Assembly: ``for`` and ``switch`` statements.
* Inline Assembly: Function definitions and function calls.
* Inline Assembly: Introduce ``keccak256`` as an opcode. ``sha3`` is still a valid alias.
* Inline Assembly: Present proper error message when not supplying enough arguments to a functional
instruction.
* Inline Assembly: introduce ``keccak256`` as an opcode. ``sha3`` is still a valid alias.
* Inline Assembly: ``for`` and ``switch`` statements.
* Inline Assembly: function definitions and function calls.
* Inline Assembly: Warn when instructions shadow Solidity variables.
* Inline Assembly: Warn when using ``jump``s.
* Type Checker: Warn about copies in storage that might overwrite unexpectedly.
* Code Generator: Added the Whiskers template system.
* Remove obsolete Why3 output.
* Type Checker: Enforce strict UTF-8 validation.
* Type Checker: Warn about copies in storage that might overwrite unexpectedly.
* Type Checker: Warn about type inference from literal numbers.
* Static Analyzer: Warn about deprecation of ``callcode``.
Bugfixes:
* Assembly: mark ``MLOAD`` to have side effects in the optimiser.
* Code generator: Use ``REVERT`` instead of ``INVALID`` for generated input validation routines.
* Type Checker: Fix address literals not being treated as compile-time constants.
* Type Checker: Disallow invoking the same modifier multiple times.
* Type Checker: Make UTF8-validation a bit more sloppy to include more valid sequences.
* Type Checker: Disallow comparisons between mapping and non-internal function types.
* Type Checker: Do not treat strings that look like addresses as addresses.
* Type Checker: Support valid, but incorrectly rejected UTF-8 sequences.
* Fixed crash concerning non-callable types.
* Unused variable warnings no longer issued for variables used inside inline assembly.
* Code Generator: Fix ABI encoding of empty literal string.
* Code Generator: Fix negative stack size checks.
* Code generator: Use ``REVERT`` instead of ``INVALID`` for generated input validation routines.
* Inline Assembly: Enforce function arguments when parsing functional instructions.
* Fixed segfault with constant function parameters
* Optimizer: Disallow optimizations involving ``MLOAD`` because it changes ``MSIZE``.
* Type Checker: Fix address literals not being treated as compile-time constants.
* Type Checker: Fixed crash concerning non-callable types.
* Type Checker: Fixed segfault with constant function parameters
* Type Checker: Disallow comparisons between mapping and non-internal function types.
* Type Checker: Disallow invoking the same modifier multiple times.
* Type Checker: Do not treat strings that look like addresses as addresses.
* Type Checker: Support valid, but incorrectly rejected UTF-8 sequences.
* Unused variable warnings no longer issued for variables used inside inline assembly.
### 0.4.11 (2017-05-03)