add letter list

go.mod

@@ -8,6 +8,7 @@ require (
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
 	github.com/go-ini/ini v1.67.0
 	github.com/mitchellh/go-homedir v1.1.0
+	github.com/mozillazg/go-pinyin v0.20.0
 	github.com/mssola/user_agent v0.6.0
 	github.com/pkg/errors v0.9.1
 	github.com/spaolacci/murmur3 v1.1.0
@@ -18,7 +19,6 @@ require (
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/mozillazg/go-pinyin v0.20.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/tidwall/match v1.1.1 // indirect
 	github.com/tidwall/pretty v1.2.1 // indirect