Update documentation

README.md

@@ -8,6 +8,10 @@ The universal proxy platform.
 
 https://sing-box.sagernet.org
 
+## Support
+
+https://community.sagernet.org/c/sing-box/
+
 ## License
 
 ```

docs/changelog.md

@@ -1,3 +1,7 @@
+#### 1.2.4
+
+* Fixes and improvements
+
 #### 1.2.3
 
 * Introducing our [new Android client application](/installation/clients/sfa)