docs: Add 1.3.0 release note

Author: jholdstock

docs/release-notes/release-notes.1.3.0.md

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+# vspd 1.3.0
+
+vspd v1.3.0 contains all development work completed since v1.2.0 (June 2023).
+All commits included in this release can be viewed
+[on GitHub](https://github.com/decred/vspd/compare/release-v1.2.0...release-v1.3.0).
+
+## Dependencies
+
+vspd 1.3.0 must be built with go 1.20 or later, and requires:
+
+- dcrd 1.8.0
+- dcrwallet 1.8.0
+
+When deploying vspd to production, always use release versions of all binaries.
+Neither vspd nor its dependencies should be built from master when handling
+mainnet tickets.
+
+## Recommended Upgrade Path
+
+The upgrade path below includes vspd downtime, during which clients will not be
+able to register new tickets, check their ticket status, or update their voting
+preferences. Voting on tickets already registered with the VSP will not be
+interrupted. You may wish to put up a temporary maintenance webpage or announce
+downtime in public channels.
+
+The upgrade path assumes dcrd and dcrwallet are already version 1.8.0.
+
+1. Build vspd from the 1.3.0 release tag.
+1. Stop vspd.
+1. **Make a backup of the vspd database file in case rollback is required.**
+1. Install new vspd binary and start it.
+1. Check vspd log file for warnings or errors.
+1. Log in to the admin webpage and check the VSP Status tab for any issues.
+
+## Notable Changes
+
+- Fee calculation now takes the new block reward subsidy split from the activation
+  of [DCP-0012](https://github.com/decred/dcps/blob/master/dcp-0012/dcp-0012.mediawiki)
+  into consideration. In practice, this means that VSPs will begin charging
+  marginally higher fees.
+- vspd will now distinguish between tickets which are "missed" and tickets which
+  are "expired". Previously these tickets would be considered as a single set
+  labelled "expired". This is acheived using dcrd and
+  [Golomb-Coded Set filters](https://github.com/decred/dcrd/tree/master/gcs#gcs).
+- vspd 1.3.0 will perform a **one-time update of every revoked ticket in the
+  database** the first time it is started. This may take a while for VSPs which
+  have been active for a long time or have a large number of revoked tickets.
+- Expired and missed tickets added to `/vspinfo`. Revoked is now deprecated.
+- Minor improvements to web UI:
+  - Homepage now displays expired and missed tickets instead of revoked tickets.
+  - Homepage only displays the current network if it is not running on mainnet.
+  - Admin page now displays decoded transactions in a human readable format
+    in addition to the raw bytes.
+- Logging has been reviewed to reduce unnecessary verbosity and to make better
+  use of log levels. Scripts or monitoring solutions which parse logs may need
+  to be updated.
+
+### Bug Fixes
+
+- Disable spell checking on admin page input for ticket hash
+  ([#397](https://github.com/decred/vspd/pull/397)).
+- Duplicate transactions will no longer cause an error when calling
+  sendrawtransaction
+  ([#398](https://github.com/decred/vspd/pull/398)).
+- Calculate missed/expired/revoked ticket ratios as percentage of all tickets,
+  not just voted tickets
+  ([#417](https://github.com/decred/vspd/pull/417)).
+- Web server returns explicit errors intead of zero values when cache is not ready
+  ([#440](https://github.com/decred/vspd/pull/440)).