impr doc and badges

README.md

@@ -6,7 +6,8 @@ lg
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 it's just primitive logger for Golang applications, yeah it's thread safe
 
@@ -61,7 +62,9 @@ func main() {
 
 # Note
 
-It's just package for demonstration. But you can to use it in production.
+It's just package for demonstration. But you can use it in production.
+It's impossible to use `log.Lshortfile` and `log.Llongfile` flags in
+this logger.
 
 # License