update README

README.md

 
 # Known Bugs
 - When using large data (>300kB) and public nodes, the writing process may fail due to rate limits. xrpio will attempt to mitigate this, but success is inconsistent.
-- xrpio will occasionally leave behind residual socket connections and timed intervals. This is an issue with the underlying xrpl library. A pull request was submitted and we are witing for the fix.
-
 
 # [Full documentation](https://gitea.nitowa.xyz/docs/xrpio)