add 0.3.1 release notes

docs/release-notes/release-notes-0.3.1.md

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+Joinmarket-clientserver 0.3.1:
+=================
+
+<https://github.com/joinmarket-org/joinmarket-clientserver/releases/tag/v0.3.1>
+
+Minor release for several useful additional features, and some minor bugfixes.
+
+Please report bugs using the issue tracker at github:
+
+<https://github.com/joinmarket-org/joinmarket-clientserver/issues>
+
+Upgrading 
+=========
+
+To upgrade: run the `install.sh` script as mentioned in the README.
+
+
+Notable changes
+===============
+
+### Electrum (servers) Blockchain Interface
+
+`ff70b3d` `b10cbe9`
+
+This is intended to help those on temporary or constrained environments, who are OK (temporarily) with a less ideal privacy model.
+
+By specifying `electrum-server` in the `blockchain_source` setting in `joinmarket.cfg` you will make your blockchain queries via a random Electrum server.
+
+Wallet sync should be fast (usually a few seconds, depending on details); usually transactions should not be significantly slowed down, either.
+
+This feature also works for testnet for testing (although there are few working Electrum servers, of course).
+
+Trying to use this feature for long running yield generators is not supported. Please continue to use Bitcoin Core in that case.
+
+### Two-Factor Mnemonic Phrases for BIP39 wallets
+
+`74c019b`
+
+This release adds support for two-factor mnemonic phrases. The user can optionally provide a passphrase or "mnemonic extension", both this extension and the 12-word mnemonic are required to recover the wallet. The feature is backward-compatible with existing BIP39 joinmarket wallet files and mnemonic phrases, and is disabled by default. See the [bitcoin wiki page](https://en.bitcoin.it/wiki/Mnemonic_phrase#Two-Factor_Mnemonic_Phrases) for more explanation on two-factor mnemonic phrases.
+
+It's now possible to have a wallet password be an empty string, and JoinMarket won't prompt for a password if so.
+
+### Significantly improved installation script
+
+`10f20ed` `8027853` `9e65d2e` `28507bd` `15433df` `ad7309e` `69d274f` `4f4f0e5` 
+
+The installation script in 0.3.0 was very primitive, this is much better. Tested on a variety of Debian/Ubuntu distros.
+
+It also checks gpg signatures, sets up the virtualenv for running joinmarket, and has additional features to encapsulate build tests.
+
+### Transaction Fees
+
+`769f2d7`
+
+This allows setting a value in `tx_fees` to customize the fee,
+particularly useful in cases where Bitcoin Core (or Electrum servers, see above) are reporting an unnecessarily high fee.
+
+See [here](https://www.reddit.com/r/joinmarket/comments/6x5m41/advice_on_fees/) for more details.
+
+### ob-watcher.py script updated for segwit
+
+`2d69a52` `5cdc379`
+
+### New yg-privacyenhanced.py script for Makers
+
+`6126697`
+
+It isn't intended to support multiple yg scripts in the main repo, this is probably the version we will stick
+with in future (there is a repo [here](https://github.com/Joinmarket-Org/custom-scripts) for experimental scripts).
+
+For now this is provided as a recommended replacement for `yield-generator-basic.py`, and it randomizes offer amounts to help privacy.
+
+### Update wallethistory feature for jm-cs/segwit
+
+`cd60cc1` `2215318`
+
+Re-implements the wallethistory option to `wallet-tool.py` as currently exists in Joinmarket-Org/joinmarket.
+
+Credits
+=======
+
+Thanks to everyone who directly contributed to this release -
+
+- @AdamISZ
+- @AlexCato
+- @fivepiece
+- @chris-belcher
+- @adlai
+- @mecampbellsoup
+
+And thanks also to those who submitted bug reports, tested and otherwise helped out.