Update UPDATE.md

UPDATE.md

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+#### Release Notes:
+Unbound 1.17.1 release fixes a number of bugs.  
+Unbound control has a new option to keep cache intact between configuration reloads. It is integrated into blocklist & roothints update.
 
+<div align="center">
+  <img src="https://user-images.githubusercontent.com/11185794/205388020-99c057ad-ee9d-440b-8df9-587f5c133f2e.png?raw=true" alt="divider"/>
+</div>
+
+#### Update:
+To update Unbound from 1.17.0 to 1.17.1. Only below steps are required:  
+* Unbound ➟ Download, Extract, CFLAGS, Configure, Compile and Install.  
+* Manually update /opt/unbound/scripts/update-blocklists.sh & /opt/unbound/scripts/update-roothints.sh  
+* Restart unbound
+
+<div align="center">
+  <img src="https://user-images.githubusercontent.com/11185794/205388020-99c057ad-ee9d-440b-8df9-587f5c133f2e.png?raw=true" alt="divider"/>
+</div>
+
+#### Fresh Install:
+Follow the README.md