Add openssh-askpass as a required dependency

Author: cipherboy

README.md

@@ -19,7 +19,7 @@ How to run it out of the box
 
 required dependencies:
 ```console
-# yum install cmake gcc-c++ openssh-clients util-linux openscap-devel qt-devel
+# yum install cmake gcc-c++ openssh-clients util-linux openscap-devel qt-devel openssh-askpass
 ```
 
 required dependencies (only for the git repo, not required for released tarballs):