修改路由匹配正则表达式，添加更多测试用例

hono/response.v

@@ -20,7 +20,7 @@ pub fn Response.text(body string) http.Response {
 	return http.Response{
 		header:      http.new_header(http.HeaderConfig{
 			key:   http.CommonHeader.content_type
-			value: 'plain/text'
+			value: 'text/plain'
 		})
 		status_code: 200
 		body:        body