Wording tweaks to security policy.

SECURITY.md

@@ -6,14 +6,13 @@ permalink: security-policy/index.html
 ## Supported versions
 
 While we want to hear about security vulnerabilities in all versions of
-borgmatic, security fixes will only be made to the most recently released
-version. It's not practical for our small volunteer effort to maintain
-multiple different release branches and put out separate security patches for
-each.
+borgmatic, security fixes are only made to the most recently released version.
+It's simply not practical for our small volunteer effort to maintain multiple
+release branches and put out separate security patches for each.
 
 ## Reporting a vulnerability
 
 If you find a security vulnerability, please [file a
 ticket](https://torsion.org/borgmatic/#issues) or [send email
 directly](mailto:witten@torsion.org) as appropriate. You should expect to hear
-back within a few days at most, and generally sooner.
+back within a few days at most and generally sooner.