upgrade.md

How to upgrade to mun-upgrade-v2

1. Vote 'yes' to upgrade proposal

mund tx gov vote [proposal_id] yes --from [wallet_name] --chain-id testmun --keyring-backend test -y

2. Upgrade binary

 wget -O update.sh https://raw.githubusercontent.com/munblockchain/mun/main/mupgrade.sh && chmod +x update.sh && sh update.sh

3. Done, It will be upgraded when Munchain reaches to the upgrade block height.