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Merge pull request #1130 from bitcoinjs/changelog

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Update CHANGELOG
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# 4.0.0
__added__
- Added [`bip32`](https://github.com/bitcoinjs/bip32) dependency as a primary export (#1073)
- Added `ECPair.fromPrivateKey` (#1070)
- Added `payments` export, with support for `p2pkh`, `p2pk`, `p2ms`, `p2sh`, `p2wpkh`, `p2wsh` and `embed` payment types (#1096, #1119)
- Added `script.signature.encode/decode` for script signatures (#459)
__changed__
- `ECPair.prototype.sign` now returns a 64-byte signature `Buffer`, not an `ECSignature` object (#1084)
- `ECPair` (and all ECDSA code) now uses [`tiny-secp256k1`](http://github.com/bitcoinjs/tiny-secp256k1), which uses the [`libsecp256k1` library](https://github.com/bitcoin-core/secp256k1) (#1070)
- `TransactionBuilder` internal variables are now `__` prefixed to discourage public usage (#1038)
- `TransactionBuilder` now defaults to version 2 transaction versions (#1036)
- `script.decompile` now returns `Buffer` or `null`, if decompilation failed (#1039)
__fixed__
- Fixed `TransactionBuilder` rejecting uncompressed public keys to comply with BIP143 (#987)
__removed__
- Removed Node 4/5 LTS support (#1080)
- Removed `ECPair.fromPublicKeyBuffer`, use `ECPair.fromPublicKey` (#1070)
- Removed `ECPair.prototype.getAddress`, use `payments.p2pkh` instead (#1085)
- Removed `ECPair.prototype.getPrivateKey`, use `ECPair.prototype.privateKey` property (#1070)
- Removed `ECPair.prototype.getPublicKey`, use `ECPair.prototype.publicKey` property (#1070)
- Removed `ECSignature`, use `script.signature.encode/decode` instead (#459)
- Removed `HDNode`, use `bip32` export instead (#1073)
- Removed `bufferutils` (#1035)
- Removed `networks.litecoin`, BYO non-Bitcoin networks instead (#1095)
- Removed `script.isCanonicalSignature`, use `script.isCanonicalScriptSignature` instead (#1094)
- Removed `script.*.input/output/check` functions (`templates`) (previously added in #681, #682) (#1119)
- Removed dependency `bigi`, uses `bn.js` internally now (via `tiny-secp256k1`) (#1070, #1112)
- Removed public access to `ECPair` constructor, use exported functions `ECPair.fromPrivateKey`, `ECPair.fromWIF`, `ECPair.makeRandom`, or `ECPair.fromPublicKey` (#1070)
# 3.3.2
__fixed__
- Fixed `decodeStack` arbitrarily supporting non-Array arguments (#942)
# 3.3.1
__changed__
- Increased the `TransactionBuilder` `maximumFeeRate` from 1000 to 2500 satoshis/byte. (#931)
# 3.3.0
__added__
- Added `ECSignature.prototype.toRSBuffer`/`ECSignature.fromRSBuffer` (#915)
- Added support to `TransactionBuilder` for 64-byte signatures via `.sign` (#915)
- Added support to `TransactionBuilder` for the `.publicKey` standard as an alternative to `.getPublicKey()` (#915)
# 3.2.1
__fixed__
- Fixed `script.scripthash.input.check` recursion (#898)
- Fixed `TransactionBuilder` sometimes ignoring witness value (#901)
- Fixed `script.witnessScriptHash.input` implementation (previously used the P2SH impl.) (#911)
# 3.2.0
__added__
- Added `address.fromBech32/toBech32` (#846)