Upgrade instructions v2 (#1067)

testnets/circulus-1/v2.0.0-update.md

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+# v2.0.0 Upgrade
+
+The upgrade is scheduled for block `2790000`, which should be about _15:00 CET on 24th November 2023_.
+
+These instructions assume you are running Cosmovisor.
+NOTE: Cosmovisor will preform a full backup unless `UNSAFE_SKIP_BACKUP=true` is set as an environment variable.
+
+### Go version
+
+Go version 1.20.x is required to run the upgrade.
+
+### Build
+
+```bash
+# get the new version (run inside the repo)
+git fetch origin --tags
+git checkout v2.0.0-rc1
+cd chain && make build && make install
+
+# check the version - should be v2.0.0-rc1
+$HOME/go/bin/empowerd version
+> 2.0.0-rc1
+# make a dir if you haven't
+mkdir -p $DAEMON_HOME/cosmovisor/upgrades/v2/bin
+
+# if you are using cosmovisor you then need to copy this new binary
+cp /home/<your-user>/go/bin/empowerd $DAEMON_HOME/cosmovisor/upgrades/v2/bin
+
+# find out what version you are about to run - should be v2.0.0-rc1
+$DAEMON_HOME/cosmovisor/upgrades/v2/bin/empowerd version
+
+```