update upgrade doc for v1.4.0

upgrade/v1.4.0.md

@@ -0,0 +1,55 @@
+# IRIS Hub Upgrade v1.4.0
+
+## Upgrade Proposal
+
+We are prepared to upgrade the IRIS Hub based upon
+
+- Version: `v1.4.0`
+- Commit hash: `ec747ae214bda191fe5aeeceefdfb590be802ec9`;
+- Chain Halt at Block Height: `17618523`;
+
+## Upgrade Process
+
+### 1. Vote
+
+```bash
+iris tx gov vote <proposal-id> <yes|no|no_with_veto|abstain> --chain-id irishub-1 --fees 0.3iris --from <MyWallet>
+```
+
+### 2. Upgrade Nodes
+
+**Note:**⚠️ This upgrade involves data migration, and the hardware configuration of the node needs to be temporarily increased:
+1. CPU: >= 4C
+2. Memory: >= 12G
+
+If the  **Upgrade Proposal**  successfully passes, the IRIS Hub will be halted automatically at around UTC `2022-11-25 05:30:00Z`, so we can upgrade all of the irishub nodes right away.
+
+**Note: All nodes have to be upgraded, whether it is a validator node, a seed node or a full node.**
+
+The specific steps are as follows:
+
+```bash
+# 1. Compile and install the new version, go 1.18+ is required
+git clone https://github.com/irisnet/irishub
+cd irishub && git checkout v1.4.0
+make install
+
+# 2. Check the version number
+iris version --long
+name: iris
+server_name: iris
+version: 1.4.0
+commit: 
+build_tags: netgo,ledger
+go: go version go1.18 darwin/amd64
+
+# 3. Close the old software
+kill -9 <iris-pid>
+
+# 4. Restart
+iris start --home=<path-to-your-home>
+```
+
+### 3. Wait for Blocks
+
+When the voting power of validators that have completed the upgrade exceeds 67%, irishub can resume producing blocks, and the upgrade is completed.