chore: sed error tip info fix

README.md

@@ -21,3 +21,16 @@ cd /root/omc.git
 cp build.ems/pkg.sh .
 bash pkg.sh --web --api -v 2.2508.1
 ```
+
+Encountered character error
+
+error: `sed: -e expression #1, char 46: Invalid collation character`
+
+```bash
+sudo apt-get update
+sudo apt-get install locales
+sudo locale-gen en_US.UTF-8
+sudo update-locale LANG=en_US.UTF-8
+source /etc/default/locale
+locale
+```