First cut at a CHANGELOG for 0.2.0 (#22)

CHANGELOG.md

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+# Change Log
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/).
+
+## [Unreleased](https://github.com/trailofbits/manticore/compare/0.2.2...HEAD)
+
+## 0.2.0 — 2018-11-02
+
+First formal release of Etheno.
+
+### Added
+
+- An [example](examples/ConstantinopleGasUsage) that can automatically reproduce [the Constantinople gas usage discrepancy](https://github.com/paritytech/parity-ethereum/pull/9746) that caused a hard-fork on Ropsten in October of 2018
+- More client integrations and support
+    - Support for JSON RPC clients that have no local accounts and only accept signed raw transactions
+    - Support for saving and loading genesis files
+    - Support for Geth with either an autogenerated or user-provided genesis
+    - Support for Parity with either an autogenerated or user-provided genesis
+    - Automated transaction synchronization between chains (_e.g._, if clients are running with different genesis blocks)
+- Improved automated testing
+    - Automated differential testing that reports differences between clients
+    - Integration with the [Echidna](https://github.com/trailofbits/echidna) EVM fuzzer
+- Improved extensibility and user friendliness 
+    - Client and Plugin API
+    - Logging framework with ANSI color on the terminal
+    - Optional log directory with client- and plugin-specific log files, including auto-generated scripts to re-run the clients
+
+### Changed
+
+- The [`BrokenMetaCoin` example](examples/BrokenMetaCoin) was improved by adding various utilities for interacting with Manticore
+
+## 0.0.1 — 2018-10-07
+
+Prerelease at TruffleCon, 2018.
+
+Initial Features:
+
+- Manticore Integration
+- Truffle Integration
+- Ganache Integration
+- JSON RPC Multiplexing