changes to allow mode be passed in the program call.

This will resolves issue no #362
#362

Author: sagartyagi121

lib/ProgramCall.js

@@ -40,8 +40,9 @@ class ProgramCall {
     this.xml = `<pgm name='${program}'`;
     if (options.lib) this.xml += ` lib='${options.lib}'`;
     if (options.func) this.xml += ` func='${options.func}'`;
+    if (options.mode) this.xml += ` mode='${options.mode}'`;
     this.xml += ` error='${options.error || 'fast'}'>`;
-  }
+  } 
 
   /**
    * @private