Update to tendermint v0.22.6-rc0 (#1798)

* Update to tendermint v0.22.6-rc0

This is comprised of updating the crypto imports / API

* (squash this) switch to v0.22.6

If this passes tests, I'll squash this commit and update the PR.

docs/sdk/core/examples/app2.go

@@ -5,7 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 
-	"github.com/tendermint/tendermint/crypto"
+	"github.com/tendermint/tendermint/crypto/ed25519"
 	cmn "github.com/tendermint/tendermint/libs/common"
 	dbm "github.com/tendermint/tendermint/libs/db"
 	"github.com/tendermint/tendermint/libs/log"
@@ -20,7 +20,7 @@ const (
 )
 
 var (
-	issuer = crypto.GenPrivKeyEd25519().PubKey().Address()
+	issuer = ed25519.GenPrivKey().PubKey().Address()
 )
 
 func NewCodec() *wire.Codec {