Launchpad (0.39) Migration

[alexanderbez]

In Launchpad 0.39 we last-minute introduced, and rightfully so, a change to BaseAccount where we removed the custom JSON marshaling because Bech32 doesn't play nicely with multisig addresses.

We need to update 0.39 migration:

func Migrate(authGenState v038auth.GenesisState) v038auth.GenesisState {
	for _, account := range authGenState.Accounts {
		// set coins to nil and allow the JSON encoding to omit coins
		if err := account.SetCoins(nil); err != nil {
			panic(fmt.Sprintf("failed to set account coins to nil: %s", err))
		}
	}

	authGenState.Accounts = v038auth.SanitizeGenesisAccounts(authGenState.Accounts)
	return authGenState
}

The migration here is meant to be 0.40 and so should be bumped.

/cc @alessio @jgimeno

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