add release notes for 0.3.3

docs/release-notes/release-notes-0.3.3.md

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+Joinmarket-clientserver 0.3.3:
+=================
+
+<https://github.com/joinmarket-org/joinmarket-clientserver/releases/tag/v0.3.3>
+
+Minor release with bech32 destination support, an important bugfix (removing possible crash vector),
+and some other minor additional features including MacOS support in the installation script.
+
+Due to the security implications of the bugfix, upgrade immediately.
+
+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. When prompted to overwrite the directory `jmvenv`, accept.
+
+
+Notable changes
+===============
+
+### Catch decryption errors in libnacl
+
+`66875aed6e1596cec3eac5323eddabc45e3bafb2`
+
+In the newest versions of the package libnacl, used for e2e encryption of messages between
+participants (since 1.5.1), a new Exception type CryptError was introduced. This will not be
+caught in previous versions of Joinmarket-clientserver, leading to a crash on certain inputs.
+For this reason it's essential to upgrade to this fix if you are running libnacl >= 1.5.1.
+You can check your version (while in the virtualenv) by typing `pip show libnacl` on the command line.
+
+### Support for spending to a bech32 address
+
+`2916d528fef2bacec87173734dab11b8b406d9e1`
+
+Now allows script and Qt users to have the destination address in any coinjoin or normal spend
+be a bech32 (native segwit) address. The address validation code is also updated. Note this does
+not add support for *spending* from bech32/native segwit.
+
+### Improvements to installation script including MacOS support
+
+`3a3b2e19295558bc563392f5aaccd33655d8708d`, `9a7bf492498f01404f577e7589ae0b6f541a43cb`, `f1be9748673cb68c1c31741b91d6e49900b94c78`, `96f29cd5a4c79f37d2af18153b67d0020e29eede`, `fc3904ee03d5f3920ea2e747e82939c930a3fe52`, `bac5390b19f2cccf5c494089975a681ebc1d11c1`, `bf1a816e27a61b1a5bdc40bc281ddf28f472ded7`
+
+A dev mode for the install script; some minor fixes; support for installation script on MacOS.
+
+### Custom sighash flag support for segwit, tainting tool
+
+`6679f92eba02b27b435ad88ed2c0a1a78889e7e1`, `8c24701d107e1a0248ece1ced7b2e346bb173d4a`
+
+This will not currently have any impact on everyday usage, but to support utxo tainting
+tools (related to adversarial fork scenarios), support was added for usage of custom
+sighash flags (SIGHASH_ANYONECANPAY, SIGHASH_SINGLE, SIGHASH_NONE) in segwit BIP141/143.
+Additionally a small script was created to allow utxo tainting, although it's been little
+tested or used for now.
+
+### Implement 'summary' flag in wallet-tool
+
+`5be58469469dbd60acd15552d7d213991eb21554`
+
+This produces a neat and shortened summary of coins in the wallet in each mixdepth.
+
+### Fix listening on all interfaces for standalone joinmarketd.py
+
+`467053beb938faecf64d17ac7fba2f7ef6c0e07a`
+
+This completes the fix in the previous release, applying it to the non-standard case
+of running joinmarketd separately.
+
+### Fix payment amount limit on 32 bit systems
+
+`b353bae139e0d60756156cc4e0a47eda14660dda`
+
+Python on 32 bit systems had a limit on integer size < the maximum spend size in satoshis,
+this is fixed using the `numbers` module.
+
+### Reconnect to bitcoind after timeout
+
+`0a55558d9ec54e36dbd85d20ec5a54dcf1d23ff9`
+
+Credits
+=======
+
+Thanks to everyone who directly contributed to this release -
+
+- @jameshilliard
+- @undeath
+- @fivepiece
+- @AdamISZ
+- @mecampbellsoup
+- @user112012
+
+And thanks also to those who submitted bug reports, tested and otherwise helped out.