fix possible typo in README.md `leaves` had been written instead of `leaks`
@@ -282,7 +282,7 @@ So you can use the following to effectively create the proper Perl regex:
### Exit Codes
-You can always set the exit code when leaves are encountered with the `--leaks-exit-code` flag. Default exit codes below:
+You can always set the exit code when leaks are encountered with the `--leaks-exit-code` flag. Default exit codes below:
```
0 - no leaks present
1 - leaks or error encountered