add v0.11.0 release notes

doc/release-notes/release-notes-v0.11.0.md

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+### MMGen Version 0.11.0 Release Notes
+
+#### Important new features:
+
+ - Subwallets: 7538a94, d1b8aef, 82086c9 (see the [Subwallets][U] wiki page for
+   additional information)
+
+ - BIP69 ordering of transaction inputs and outputs: 6b2c138
+
+ - Support for Microsoft Windows via MSYS2: dcab109, 13ab257 (see the
+   [Install MMGen on Microsoft Windows][W] wiki page for complete
+   information.  Windows users should note the following caveats:
+     + no [autosigning][X] support
+     + no [Monero wallet creation/syncing support][M] (due to password file
+       descriptor issues with monero-wallet-cli)
+     + due to unpredictable behavior of MSYS2's Python `getpass()`
+       implementation, passwords containing non-ASCII symbols should be entered
+       using the `--echo-passphrase` option or via a password file.  Otherwise,
+       these symbols might end up being silently ignored.
+     + Though MSYS2 support is well tested and considered stable, it’s a new
+       feature and other glitches might remain.  If you think you've found a
+       bug, don't hesistate to file an issue at
+       <https://github.com/mmgen/mmgen/issues>.
+
+
+#### Other changes/additions:
+
+ - rewritten `mmgen-tool` utility: 729a547
+ - new `tooltest2.py` test: 558fa58
+ - new `unit_tests.py` test: e2d5146, ab8b5d0
+ - rewritten and modularized `test.py` test suite: 91410dd
+ - complete rewrite of SHA2 implementation used for Zcash addresses: 2b6dc95
+ - use of `cryptography` package instead of `pycrypto`: 8a3b921, 7cc69a2
+ - `pysha3` package dependency eliminated by using native Python implementation
+   of Keccak hash function: a7126ed
+ - dependencies on all Ethereum packages except `py_ecc` eliminated: 66d0f76,
+   a7126ed
+ - autosign: list non-MMGen output addresses and amounts as well as failed
+   signing operations after each program run: d558822, 85236cd
+
+This release has been tested on the following platforms:
+
+        Ubuntu Bionic / x86_64
+        Ubuntu Xenial (+Python 3.6.7) / x86_64
+        Armbian Bionic / Orange Pi PC2 (no Parity or Monerod)
+        Raspbian Stretch / Raspberry Pi B (no Parity or Monerod)
+        Windows 7 Ultimate Eng. SP1 / MSYS2 / qemu-x86_64
+        Windows 10 Professional Eng. / MSYS2 / qemu-x86_64
+
+and with the following coin daemon versions:
+
+        Bitcoin Core v0.17.1, v0.18.0
+        Bitcoin-ABC v0.19.1, v0.19.6
+        Litecoin Core v0.16.3, v0.17.1
+        Monerod v0.14.0.2
+        Parity Ethereum v2.5.1
+
+Altcoin address generation has been additionally tested using the following
+tools as references:
+
+        zcash-mini a2b3504 (https://github.com/FiloSottile/zcash-mini)
+        pycoin 6fb55ec (https://github.com/richardkiss/pycoin)
+        vanitygen-plus 2212312 (https://github.com/exploitagency/vanitygen-plus)
+
+[U]: https://github.com/mmgen/mmgen/wiki/Subwallets
+[X]: https://github.com/mmgen/mmgen/wiki/autosign-[MMGen-command-help]
+[W]: https://github.com/mmgen/mmgen/wiki/Install-MMGen-on-Microsoft-Windows
+[M]: https://github.com/mmgen/mmgen/wiki/Altcoin-and-Forkcoin-Support#a_xmr