Update improvement.md

Author: pydanny

.github/ISSUE_TEMPLATE/improvement.md

@@ -5,20 +5,13 @@ about: Let us know how we could improve
 
 ## Description
 
-[//]: # (What's it you're proposing? How should it be implemented?)
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 ## Rationale
 
-[//]: # (Why should this feature be implemented?)
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 ## Use case(s) / visualization(s)
 
-[//]: # ("Better to see something once than to hear about it a thousand times.")