Fix README

Former-commit-id: 43117e5

Author: MonolithProjects

README.md

@@ -15,7 +15,7 @@ Requirements
 * Supported Linux distros:
   * CentOS/RHEL 7,8
   * Fedora 16+
-  * Ubuntu 16,17
+  * Ubuntu 16,18
 
 * System must have access to the GitHub.