Merge pull request #260 from roc-lang/256-byte-limit-docs

add 256 byte limit to docs

platform/Stdin.roc

@@ -64,6 +64,7 @@ line =
     |> Task.mapErr handleErr
 
 ## Read bytes from [standard input](https://en.wikipedia.org/wiki/Standard_streams#Standard_input_(stdin)).
+## ‼️ This function can read no more than 256 bytes at a time. Use [readToEnd] if you need more.
 ##
 ## > This is typically used in combintation with [Tty.enableRawMode],
 ## which disables defaults terminal bevahiour and allows reading input