doc: Add historical release notes 0.9.5

doc/release-notes/release-notes-0.9.5.md

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+Bitcoin Core version 0.9.5 is now available from:
+
+  https://bitcoin.org/bin/0.9.5/
+
+This is a new minor version release, with the goal of backporting BIP66. There
+are also a few 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
+
+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).
+
+Notable changes
+================
+
+Mining and relay policy enhancements
+------------------------------------
+
+Bitcoin Core's block templates are now for version 3 blocks only, and any mining
+software relying on its `getblocktemplate` must be updated in parallel to use
+libblkmaker either version 0.4.2 or any version from 0.5.1 onward.
+If you are solo mining, this will affect you the moment you upgrade Bitcoin
+Core, which must be done prior to BIP66 achieving its 951/1001 status.
+If you are mining with the stratum mining protocol: this does not affect you.
+If you are mining with the getblocktemplate protocol to a pool: this will affect
+you at the pool operator's discretion, which must be no later than BIP66
+achieving its 951/1001 status.
+
+0.9.5 changelog
+================
+
+- `74f29c2` Check pindexBestForkBase for null
+- `9cd1dd9` Fix priority calculation in CreateTransaction
+- `6b4163b` Sanitize command strings before logging them.
+- `3230b32` Raise version of created blocks, and enforce DERSIG in mempool
+- `989d499` Backport of some of BIP66's tests
+- `ab03660` Implement BIP 66 validation rules and switchover logic
+- `8438074` build: fix dynamic boost check when --with-boost= is used
+
+Credits
+--------
+
+Thanks to who contributed to this release, at least:
+
+- 21E14
+- Alex Morcos
+- Cory Fields
+- Gregory Maxwell
+- Pieter Wuille
+- Wladimir J. van der Laan
+
+As well as everyone that helped translating on [Transifex](https://www.transifex.com/projects/p/bitcoin/).