Add presence intent into .env.example

Author: raidensakura

.env.example

@@ -19,6 +19,9 @@ CONNECTION_URI=mongod+srv://mongo.net
 # The path to your log viewer extending from your `LOG_URL`, defaults to "/logs"
 # LOG_URL_PREFIX=/logs
 
+# Enable presence intent for the bot, defaults to false
+# ENABLE_PRESENCE_INTENT=false
+
 # A github personal access token with the repo scope to access private repository
 # GITHUB_TOKEN=abcdef