doc:(for review) add a test on go1.23.0

Author: sttk

README.md

@@ -37,33 +37,39 @@ This library supports Go 1.18 or later.
 % gvm-fav
 Now using version go1.18.10
 go version go1.18.10 darwin/amd64
-ok  	github.com/sttk/cliargs	0.913s	coverage: 97.6% of statements
-ok  	github.com/sttk/cliargs/errors	1.053s	coverage: 100.0% of statements
-ok  	github.com/sttk/cliargs/validators	0.538s	coverage: 100.0% of statements
+ok  	github.com/sttk/cliargs	0.907s	coverage: 97.6% of statements
+ok  	github.com/sttk/cliargs/errors	1.052s	coverage: 100.0% of statements
+ok  	github.com/sttk/cliargs/validators	0.553s	coverage: 100.0% of statements
 
 Now using version go1.19.13
 go version go1.19.13 darwin/amd64
-ok  	github.com/sttk/cliargs	0.895s	coverage: 97.6% of statements
-ok  	github.com/sttk/cliargs/errors	1.034s	coverage: 100.0% of statements
-ok  	github.com/sttk/cliargs/validators	0.541s	coverage: 100.0% of statements
+ok  	github.com/sttk/cliargs	0.915s	coverage: 97.6% of statements
+ok  	github.com/sttk/cliargs/errors	1.085s	coverage: 100.0% of statements
+ok  	github.com/sttk/cliargs/validators	0.569s	coverage: 100.0% of statements
 
 Now using version go1.20.14
 go version go1.20.14 darwin/amd64
-ok  	github.com/sttk/cliargs	0.551s	coverage: 97.6% of statements
-ok  	github.com/sttk/cliargs/errors	1.054s	coverage: 100.0% of statements
-ok  	github.com/sttk/cliargs/validators	1.568s	coverage: 100.0% of statements
+ok  	github.com/sttk/cliargs	0.559s	coverage: 97.6% of statements
+ok  	github.com/sttk/cliargs/errors	1.065s	coverage: 100.0% of statements
+ok  	github.com/sttk/cliargs/validators	1.590s	coverage: 100.0% of statements
 
 Now using version go1.21.13
 go version go1.21.13 darwin/amd64
-ok  	github.com/sttk/cliargs	0.560s	coverage: 97.6% of statements
-ok  	github.com/sttk/cliargs/errors	1.073s	coverage: 100.0% of statements
-ok  	github.com/sttk/cliargs/validators	1.587s	coverage: 100.0% of statements
+ok  	github.com/sttk/cliargs	1.613s	coverage: 97.6% of statements
+ok  	github.com/sttk/cliargs/errors	0.537s	coverage: 100.0% of statements
+ok  	github.com/sttk/cliargs/validators	1.061s	coverage: 100.0% of statements
 
 Now using version go1.22.6
 go version go1.22.6 darwin/amd64
-ok  	github.com/sttk/cliargs	0.555s	coverage: 97.6% of statements
-ok  	github.com/sttk/cliargs/errors	1.058s	coverage: 100.0% of statements
-ok  	github.com/sttk/cliargs/validators	1.583s	coverage: 100.0% of statements
+ok  	github.com/sttk/cliargs	0.607s	coverage: 97.6% of statements
+ok  	github.com/sttk/cliargs/errors	1.712s	coverage: 100.0% of statements
+ok  	github.com/sttk/cliargs/validators	1.160s	coverage: 100.0% of statements
+
+Now using version go1.23.0
+go version go1.23.0 darwin/amd64
+ok  	github.com/sttk/cliargs	1.743s	coverage: 97.6% of statements
+ok  	github.com/sttk/cliargs/errors	0.599s	coverage: 100.0% of statements
+ok  	github.com/sttk/cliargs/validators	1.160s	coverage: 100.0% of statements
 
 Back to go1.22.6
 Now using version go1.22.6