Issue 109 respect min value , not hardcode

This should fix issue #109 

replace hardcoded value with input

Author: rubenCodeforges

src/module/component/mat-password-strength/mat-password-strength.component.ts

@@ -87,7 +87,7 @@ export class MatPasswordStrengthComponent implements OnInit, OnChanges {
   }
 
   private _containAtLeastEightChars(): boolean {
-    this.containAtLeastEightChars = this.password.length >= 8;
+    this.containAtLeastEightChars = this.password.length >= this.min;
     return this.containAtLeastEightChars;
   }