Correct URL for #plaintextaccounting

Author: afh

source/contribute.html.md

@@ -26,5 +26,5 @@ The [ledger source code](https://git.ledger-cli.org/) is available on GitHub, co
 
 **Twitter**
 [#ledgercli](https://twitter.com/search?q=%23ledgercli&src=typd&f=realtime) Ledger-related tweets
-[#plaintextaccounting](https://twitter.com/search?q=%23ledgercli&src=typd&f=realtime) plain text accounting in general
+[#plaintextaccounting](https://twitter.com/search?q=%23plaintextaccounting&src=typd&f=realtime) plain text accounting in general
 [@LedgerTips](https://twitter.com/ledgertips) tips for Ledger, hledger, beancount and similar