Update of ISSUE_TEMPLATE (#66)

* Added information about requirement version of angular/cli

* Added link to simple demo app on Stackblitz and Handsontable, Angular version to "Your environment" section.

Author: MateuszG

.github/ISSUE_TEMPLATE.md

@@ -8,9 +8,12 @@
 3.
 
 ### Demo
-<!--- Provide a link to a live example on JSFiddle or Codepen -->
+<!--- Provide a link to a live example on Stackblitz -->
+https://stackblitz.com/edit/handsontable-angular
 
 ### Your environment
+* Angular version:
+* Handsontable version:
 * Wrapper version:
 * Browser Name and version:
 * Operating System: