Update vendors

vendor/github.com/huandu/xstrings/convert.go

@@ -44,25 +44,18 @@ func ToCamelCase(str string) string {
 		return buf.String()
 	}
 
-	r0 = unicode.ToUpper(r0)
+	buf.WriteRune(unicode.ToUpper(r0))
+	r0, size = utf8.DecodeRuneInString(str)
+	str = str[size:]
 
 	for len(str) > 0 {
 		r1 = r0
 		r0, size = utf8.DecodeRuneInString(str)
 		str = str[size:]
 
-		if r1 == '_' && r0 == '_' {
-			buf.WriteRune(r1)
-			continue
-		}
-
-		if r1 == '_' {
+		if r1 == '_' && r0 != '_' {
 			r0 = unicode.ToUpper(r0)
 		} else {
-			r0 = unicode.ToLower(r0)
-		}
-
-		if r1 != '_' {
 			buf.WriteRune(r1)
 		}
 	}