Updating the version to rc1

Change-Id: I375da2826888f2fc2dd737191862e4d0e46cd013

htdocs/lib/version.php

@@ -18,6 +18,6 @@ $config = new stdClass();
 
 $config->version = 2018091200;
 $config->series = '18.10';
-$config->release = '18.10dev';
+$config->release = '18.10rc1';
 $config->minupgradefrom = 2017031605;
 $config->minupgraderelease = '17.04.0 (release tag 17.04.0_RELEASE)';