Add open collective link

Author: kblok

ISSUE_TEMPLATE.md

@@ -45,4 +45,7 @@ var page = browser.NewPageAsync();
 
 ### Additional Information
 
-Any additional information, configuration or data that might be necessary to reproduce the issue.
+Any additional information, configuration or data that might be necessary to reproduce the issue.
+
+<!-- Love parcel? Please consider supporting our collective:
+👉  https://opencollective.com/puppeteer-sharp/donate -->