Update nestedUnit shellscript implementation fully working with async.

Author: Dr. Safi

module/reusableNestedUnit/implementation/shellscript/Unit.class.js

@@ -18,17 +18,21 @@ export default ({ Superclass }) => {
         @extendedSubclassPattern.Subclass()
         class Unit extends Superclass {
             async executeScript() {
-                switch (this.implementation) {
-                    case 'spawn':
-                        let message = ` _____                          _        
+                let message = ` _____                          _        
 | ____|__  __ ___   ___  _   _ | |_  ___ 
 |  _|  \\ \\/ // _ \\ / __|| | | || __|/ _ \\
 | |___  >  <|  __/| (__ | |_| || |_|  __/    
 |_____|/_/\\_\\\\___| \\___| \\__,_| \\__|\\___|
 ${this.command} ${this.argument}`;
+                switch (this.implementation) {
+                    case 'spawn':
                         console.log(message)
                         spawnSync(this.command, this.argument, this.option)
                     break;
+                    case 'spawnAsynchronous':
+                        console.log(message)
+                        spawn(this.command, this.argument, this.option)
+                    break;
                     default:
                         console.log('shellscriptUnit.implementation does not match any option.')
                     break;