update readme advanced usage on CLI

README.md

@@ -61,7 +61,7 @@ python -m srtranslator ./filepath/to/srt -i SRC_LANG -o DEST_LANG
 ## Advanced usage
 
 ```
-usage: __main__.py [-h] [-i SRC_LANG] [-o DEST_LANG] [-v] [-vv] [-s] [-w WRAP_LIMIT] path
+usage: __main__.py [-h] [-i SRC_LANG] [-o DEST_LANG] [-v] [-vv] [-s] [-w WRAP_LIMIT] [-t {deepl-scrap,translatepy,deepl-api}] [--auth AUTH] path
 
 Translate an .STR file
 
@@ -79,4 +79,7 @@ options:
   -s, --show-browser    Show browser window
   -w WRAP_LIMIT, --wrap-limit WRAP_LIMIT
                         Number of characters -including spaces- to wrap a line of text. Default: 50
+  -t {deepl-scrap,translatepy,deepl-api}, --translator {deepl-scrap,translatepy,deepl-api}
+                        Built-in translator to use
+  --auth AUTH           Api key if needed on translator
 ```