Update README.md

- Removed "Participate" section, that is already in the website.
- Added new issue about timeouts in the Troubleshooting section

README.md

@@ -8,13 +8,10 @@ Created by [@tinchoabbate](https://twitter.com/tinchoabbate) at OpenZeppelin
 
 Visit [damnvulnerabledefi.xyz](https://damnvulnerabledefi.xyz)!
 
-## Participate
-
-Share your solutions, comments, feedback and more in Twitter with [#DamnVulnerableDeFi](https://twitter.com/hashtag/DamnVulnerableDeFi).
-
 ## Troubleshooting
 
 - Some users have reported [issues](https://github.com/OpenZeppelin/damn-vulnerable-defi/issues/1) with specific versions of node. I have succesfully installed all dependencies, and executed all challenges, with version `v12.20.0`. If you're using a different version of node and are having problems during the setup, try switching to version `v12.20.0`.
+- Some users have reported [issues](https://github.com/OpenZeppelin/damn-vulnerable-defi/pull/4) with the timeout set in the `package.json` file for "The Rewarder" challenge. If you're having trouble executing your exploit for this challenge, try increasing the timeout.
 
 ## Disclaimer