Readme for version with providers

Readme.md

@@ -48,6 +48,7 @@ import (
 
     _ "github.com/go-sql-driver/mysql"
     "github.com/iamsalnikov/mymigrate"
+	"github.com/iamsalnikov/mymigrate/provider/mysql"
 )
 
 func main() {
@@ -56,7 +57,8 @@ func main() {
         log.Fatalln(err)
     }
 
-    mymigrate.SetDatabase(db)
+	provider := mysql.NewMysqlProvider(db)
+    mymigrate.SetDatabaseProvider(provider)
 ```
 
 ### Add migrations
@@ -161,4 +163,4 @@ Package `github.com/iamsalnikov/mymigrate/cobracmd` export next commands:
 - [NewListCmd](cobracmd/new_cmd.go) - command to view a list of new migrations
 - [MigrateCmd](cobracmd/cmd.go) - root command to work with migrations
 
-Also you can find at `github.com/iamsalnikov/mymigrate/cobracmd` functions for cobra commands if you want to configure commands by yourself.
+Also you can find at `github.com/iamsalnikov/mymigrate/cobracmd` functions for cobra commands if you want to configure commands by yourself.