Update ISSUE_TEMPLATE

.github/ISSUE_TEMPLATE

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-Hi ! Thank you for reporting an issue, but we would like to remind you, we have a trouble shooting page in our wiki. You may need to take a look on that page, perhaps the answer is just right there :p 
+Hi ! Thank you for reporting an issue, but we would like to remind you, we have a trouble shooting page in our wiki. You may want to take a look on that page :p 
+
+* issues which have been tagged as 'needs feedback', will be closed after 2 weeks if receive no feedbacks.