Fixed missing hyperlink for issues in CONTRIBUTING.md

Author: avery-kuo

CONTRIBUTING.md

@@ -62,7 +62,7 @@ Please ensure that your bug report has the following:
 
 ## Feature Requests
 
-Open an [issue][] with the following:
+Open an [issue][issues] with the following:
 
 * A short, descriptive title. Ideally, other community members should be able to get a 
    good idea of the feature just from reading the title.