Update README

Author: sashakames

README

@@ -9,7 +9,7 @@ Manual esg-search update
 
 # Using > v4.0, service control differs with v2.x, use esg-node stop/start
 # download search module (verify module version
-wget https://github.com/ESGF/esg-search/releases/download/v4.17.10/esg-search.war
+wget https://github.com/ESGF/esg-search/releases/download/v4.18.0/esg-search.war
 /usr/local/tomcat/bin/catalina.sh stop # stop tomcat
 mv /usr/local/tomcat/webapps/esg-search /tmp # move old version aside
 rm -rf /usr/local/tomcat/work/Catalina/localhost/esg-search # clean out cache