doc: Add historical release notes for 0.9.3

doc/release-notes/release-notes-0.9.3.md

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+Bitcoin Core version 0.9.3 is now available from:
+
+  https://bitcoin.org/bin/0.9.3/
+
+This is a new minor version release, bringing only bug fixes and updated
+translations. Upgrading to this release is recommended.
+
+Please report bugs using the issue tracker at github:
+
+  https://github.com/bitcoin/bitcoin/issues
+
+Upgrading and downgrading
+==========================
+
+How to Upgrade
+--------------
+
+If you are running an older version, shut it down. Wait until it has completely
+shut down (which might take a few minutes for older versions), then run the
+installer (on Windows) or just copy over /Applications/Bitcoin-Qt (on Mac) or
+bitcoind/bitcoin-qt (on Linux).
+
+If you are upgrading from version 0.7.2 or earlier, the first time you run
+0.9.3 your blockchain files will be re-indexed, which will take anywhere from 
+30 minutes to several hours, depending on the speed of your machine.
+
+Downgrading warnings
+--------------------
+
+The 'chainstate' for this release is not always compatible with previous
+releases, so if you run 0.9.x and then decide to switch back to a
+0.8.x release you might get a blockchain validation error when starting the
+old release (due to 'pruned outputs' being omitted from the index of
+unspent transaction outputs).
+
+Running the old release with the -reindex option will rebuild the chainstate
+data structures and correct the problem.
+
+Also, the first time you run a 0.8.x release on a 0.9 wallet it will rescan
+the blockchain for missing spent coins, which will take a long time (tens
+of minutes on a typical machine).
+
+0.9.3 Release notes
+=======================
+
+RPC:
+- Avoid a segfault on getblock if it can't read a block from disk
+- Add paranoid return value checks in base58
+
+Protocol and network code:
+- Don't poll showmyip.com, it doesn't exist anymore
+- Add a way to limit deserialized string lengths and use it
+- Add a new checkpoint at block 295,000
+- Increase IsStandard() scriptSig length
+- Avoid querying DNS seeds, if we have open connections
+- Remove a useless millisleep in socket handler
+- Stricter memory limits on CNode
+- Better orphan transaction handling
+- Add `-maxorphantx=<n>` and `-maxorphanblocks=<n>` options for control over the maximum orphan transactions and blocks
+
+Wallet:
+- Check redeemScript size does not exceed 520 byte limit
+- Ignore (and warn about) too-long redeemScripts while loading wallet
+
+GUI:
+- fix 'opens in testnet mode when presented with a BIP-72 link with no fallback'
+- AvailableCoins: acquire cs_main mutex
+- Fix unicode character display on MacOSX
+
+Miscellaneous:
+- key.cpp: fail with a friendlier message on missing ssl EC support
+- Remove bignum dependency for scripts
+- Upgrade OpenSSL to 1.0.1i (see https://www.openssl.org/news/secadv_20140806.txt - just to be sure, no critical issues for Bitcoin Core)
+- Upgrade miniupnpc to 1.9.20140701
+- Fix boost detection in build system on some platforms
+
+Credits
+--------
+
+Thanks to everyone who contributed to this release:
+
+- Andrew Poelstra
+- Cory Fields
+- Gavin Andresen
+- Jeff Garzik
+- Johnathan Corgan
+- Julian Haight
+- Michael Ford
+- Pavel Vasin
+- Peter Todd
+- phantomcircuit
+- Pieter Wuille
+- Rose Toomey
+- Ruben Dario Ponticelli
+- shshshsh
+- Trevin Hofmann
+- Warren Togami
+- Wladimir J. van der Laan
+- Zak Wilcox
+
+As well as everyone that helped translating on [Transifex](https://www.transifex.com/projects/p/bitcoin/).