Deprecated CSRF token variable

Author: fspv

README.md

@@ -26,9 +26,8 @@ virtualenv -p python3 leetcode-anki
 . leetcode-anki/bin/activate
 ```
 
-Then initialize necessary environment variables. You can get the values directly from your browser (if you're using chrome, cookies can be found here chrome://settings/cookies/detail?site=leetcode.com)
+Then initialize session id variable. You can get it directly from your browser (if you're using chrome, cookies can be found here chrome://settings/cookies/detail?site=leetcode.com)
 ```
-export LEETCODE_CSRF_TOKEN="xxx"
 export LEETCODE_SESSION_ID="yyy"
 ```