bump to 0.2.23

- code quality
- supports `SetCurrentHelpPainter(painter)`
- supports `WalkAllCommands(nil, ...)`
- add a set of `cmdr.GetXxxR()`, `cmdr.GetXxxRP()`
- supports `SetUnknownOptionHandler(...)`
- supports Smart suggestions for wrong command and flags
- others...

Author: hedzr

doc.go

@@ -8,7 +8,7 @@ const (
 	// AppName const
 	AppName = "cmdr" // main app-name
 	// Version const
-	Version = "0.2.21" // version name
+	Version = "0.2.23" // version name
 	// VersionInt const
-	VersionInt = 0x000215 // using as
+	VersionInt = 0x000217 // using as
 )