chore: Post release maintenance (#432)

* adding "latest" upgrade handler

* updating chain upgrade test for v4 release

* Update CHANGELOG.md

CHANGELOG.md

@@ -28,6 +28,20 @@ Contains bug fixes.
 Contains all the PRs that improved the code without changing the behaviours.
 -->
 
+## [Unreleased]
+
+### Added
+
+### Changed
+
+### Deprecated
+
+### Removed
+
+### Fixed
+
+### Improvements
+
 ## [v4.0.0]
 
 ### Added

app/app_upgrades.go

@@ -11,6 +11,7 @@ import (
 	upgrade2_0_0 "github.com/archway-network/archway/app/upgrades/2_0_0"
 	upgrade3_0_0 "github.com/archway-network/archway/app/upgrades/3_0_0"
 	upgrade4_0_0 "github.com/archway-network/archway/app/upgrades/4_0_0"
+	upgradelatest "github.com/archway-network/archway/app/upgrades/latest"
 )
 
 // UPGRADES
@@ -21,6 +22,8 @@ var Upgrades = []upgrades.Upgrade{
 	upgrade2_0_0.Upgrade,      // v2.0.0
 	upgrade3_0_0.Upgrade,      // v3.0.0
 	upgrade4_0_0.Upgrade,      // v4.0.0
+
+	upgradelatest.Upgrade, // latest - This upgrade handler is used for all the current changes to the protocol
 }
 
 func (app *ArchwayApp) setupUpgrades() {

app/upgrades/latest/upgrades.go

@@ -0,0 +1,24 @@
+package upgradelatest
+
+import (
+	storetypes "github.com/cosmos/cosmos-sdk/store/types"
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/cosmos/cosmos-sdk/types/module"
+	upgradetypes "github.com/cosmos/cosmos-sdk/x/upgrade/types"
+
+	"github.com/archway-network/archway/app/upgrades"
+)
+
+// This upgrade handler is used for all the current changes to the protocol
+
+const Name = "latest"
+
+var Upgrade = upgrades.Upgrade{
+	UpgradeName: Name,
+	CreateUpgradeHandler: func(mm *module.Manager, cfg module.Configurator) upgradetypes.UpgradeHandler {
+		return func(ctx sdk.Context, plan upgradetypes.Plan, fromVM module.VersionMap) (module.VersionMap, error) {
+			return mm.RunMigrations(ctx, cfg, fromVM)
+		}
+	},
+	StoreUpgrades: storetypes.StoreUpgrades{},
+}

interchaintest/setup.go

@@ -8,8 +8,8 @@ import (
 )
 
 const (
-	initialVersion = "v3.0.0" // The last release of the chain. The one the mainnet is running on
-	upgradeName    = "v4.0.0" // The next upgrade name. Should match the upgrade handler.
+	initialVersion = "v4.0.0" // The last release of the chain. The one the mainnet is running on
+	upgradeName    = "latest" // The next upgrade name. Should match the upgrade handler.
 	chainName      = "archway"
 )