add changelog and version

CHANGELOG.md

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+# Changelog
+
+## 0.2.0 (May 15, 2017)
+
+BREAKING CHANGES:
+
+- [hd] The following functions no longer take a `coin string` as argument: `ComputeAddress`, `AddrFromPubKeyBytes`, `ComputeAddressForPrivKey`, `ComputeWIF`, `WIFFromPrivKeyBytes`
+- Changes to `PrivKey`, `PubKey`, and `Signature` (denoted `Xxx` below):
+  - interfaces are renamed `XxxInner`, and are not for use outside the package, though they must be exposed for sake of serialization.
+  - `Xxx` is now a struct that wraps the corresponding `XxxInner` interface
+
+FEATURES:
+
+- `github.com/tendermint/go-keys -> github.com/tendermint/go-crypto/keys` - command and lib for generating and managing encrypted keys
+- [hd] New function `WIFFromPrivKeyBytes(privKeyBytes []byte, compress bool) string`
+- Changes to `PrivKey`, `PubKey`, and `Signature` (denoted `Xxx` below):
+  - Expose a new method `Unwrap() XxxInner` on the `Xxx` struct which returns the corresponding `XxxInner` interface
+  - Expose a new method `Wrap() Xxx` on the `XxxInner` interface which returns the corresponding `Xxx` struct
+
+IMPROVEMENTS:
+
+- Update to use new `tmlibs` repository
+
+## 0.1.0 (April 14, 2017)
+
+Initial release
+

version.go

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+package crypto
+
+const Version = "0.2.0"