Update README.md

ip2location · web-flow · commit b2a5c6c1288c · 2022-12-21T10:28:42.000+08:00
diff --git a/README.md b/README.md
@@ -1,5 +1,5 @@
 [![Go Report Card](https://goreportcard.com/badge/github.com/ip2location/ip2location-go/v9)](https://goreportcard.com/report/github.com/ip2location/ip2location-go/v9)
-
+[![PkgGoDev](https://pkg.go.dev/badge/github.com/ip2location/ip2location-go/v9)](https://pkg.go.dev/github.com/ip2location/ip2location-go/v9)
 
 # IP2Location Go Package
 
@@ -513,4 +513,4 @@ func main() {
 
 	fmt.Printf("region code: %s\n", res)
 }
-```
+```

Original file line number	Diff line number	Diff line change
`@@ -1,5 +1,5 @@`
`1`	`1`	`[![Go Report Card](https://goreportcard.com/badge/github.com/ip2location/ip2location-go/v9)](https://goreportcard.com/report/github.com/ip2location/ip2location-go/v9)`
`2`		`-`
	`2`	`+[![PkgGoDev](https://pkg.go.dev/badge/github.com/ip2location/ip2location-go/v9)](https://pkg.go.dev/github.com/ip2location/ip2location-go/v9)`
`3`	`3`
`4`	`4`	`# IP2Location Go Package`
`5`	`5`
`@@ -513,4 +513,4 @@ func main() {`
`513`	`513`
`514`	`514`	`fmt.Printf("region code: %s\n", res)`
`515`	`515`	`}`
`516`		-```
	`516`	+```