Added option to view Voided bills

bookie/src/app/sales/bill-number/bill-number.component.html

@@ -13,6 +13,7 @@
           <mat-option value="1">Regular Bill</mat-option>
           <mat-option value="4">Staff</mat-option>
           <mat-option value="2">No Charge</mat-option>
+          <mat-option value="8">Void</mat-option>
         </mat-select>
       </mat-form-field>
       <mat-form-field fxFlex>