docs: Add release notes for v2.0.5.

docs/release-notes/release-notes-2.0.5.md

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+# dcrd v2.0.5 Release Notes
+
+This is a patch release of dcrd which includes the following changes:
+
+- Improved StakeShuffle mixing robustness against misbehaving peers
+- Peers are no longer intermittently disconnected when serving factored
+  polynomial data
+
+## Upgrade Required To Participate in StakeShuffle Mixing
+
+Although upgrading to this latest release is not required for continued
+operation of the core network, it is required for anyone who wishes to
+participate in StakeShuffle mixing with the highest anonymity set guarantees and
+fastest matching.
+
+## Changelog
+
+This patch release consists of 8 commits from 2 contributors which total to 8
+files changed, 83 additional lines of code, and 56 deleted lines of code.
+
+All commits since the last release may be viewed on GitHub
+[here](https://github.com/decred/dcrd/compare/release-v2.0.4...release-v2.0.5).
+
+### Protocol and network:
+
+- [release-v2.0] peer: Add factored poly to stall detector ([decred/dcrd#3457](https://github.com/decred/dcrd/pull/3457))
+
+### Mixing message relay (mix pool):
+
+- [release-v2.0] mixpool: Do not return early for revealed secrets ([decred/dcrd#3458](https://github.com/decred/dcrd/pull/3458))
+
+### Developer-related package and module changes:
+
+- [release-v2.0] mixclient: Avoid jitter calculation panic ([decred/dcrd#3458](https://github.com/decred/dcrd/pull/3458))
+- [release-v2.0] mixclient: Detect exited csppsolver processes ([decred/dcrd#3458](https://github.com/decred/dcrd/pull/3458))
+- [release-v2.0] mixclient: Sort roots for slot assignment ([decred/dcrd#3458](https://github.com/decred/dcrd/pull/3458))
+
+### Developer-related module management:
+
+- [release-v2.0] main: Use backported peer updates ([decred/dcrd#3457](https://github.com/decred/dcrd/pull/3457))
+- [release-v2.0] main: Use backported mixing updates ([decred/dcrd#3458](https://github.com/decred/dcrd/pull/3458))
+
+### Misc:
+
+- [release-v2.0] release: Bump for 2.0.5 ([decred/dcrd#3459](https://github.com/decred/dcrd/pull/3459))
+
+### Code Contributors (alphabetical order):
+
+- Dave Collins
+- Josh Rickmar