Update README.md

README.md

@@ -26,7 +26,7 @@ Most of these values will be in the form of `key:: value` for easy integration w
 $ ./mastodon-bookmarks YOUR_INSTANCE YOUR_APP_TOKEN
 ```
 
-The `YOUR_INSTANCE` value must not have trailing slash (e.g: `https://hachyderm.io`)
+The `YOUR_INSTANCE` value must not have the trailing slash (e.g: `https://hachyderm.io`)
 
 ## Development