Updated README

Author: mdecimus

README.md

@@ -1,10 +1,11 @@
 # Stalwart SMTP Server
 
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 [![License: AGPL v3](https://img.shields.io/badge/License-AGPL_v3-blue.svg)](https://www.gnu.org/licenses/agpl-3.0)
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 **Stalwart SMTP** is a modern SMTP server developed in Rust with a focus on security, speed, and extensive configurability. 
 It features built-in DMARC, DKIM, SPF and ARC support for message authentication, strong transport security through DANE, MTA-STS and SMTP TLS reporting, and offers great flexibility and customization thanks to its dynamic configuration rules and native support for Sieve scripts.
@@ -23,7 +24,7 @@ Key features:
   - SMTP TLS Reporting (**TLSRPT**) delivery and analysis.
 - Inbound Filtering and Throttling:
   - Sieve scripting language with support for all [registered extensions](https://www.iana.org/assignments/sieve-extensions/sieve-extensions.xhtml).
-  - Milter support.
+  - **Milter** support.
   - Filtering, modification and removal of MIME parts or headers.
   - DNS block lists (**DNSBL**) & Greylisting.
   - Inbound concurrency & rate limiting.