Update bug_report.md

Author: willmcgugan

.github/ISSUE_TEMPLATE/bug_report.md

@@ -7,8 +7,12 @@ assignees: ''
 
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-Please give a brief but clear explanation of what the issue is. Let us know what the behaviour you expect is, and what is actually happening. Let us know what operating system you are running on, and what terminal you are using.
+Have you checked closed issues? https://github.com/Textualize/textual/issues?q=is%3Aissue+is%3Aclosed
+
+Please give a brief but clear explanation of the issue.
+
+What Operating System are you running on?
 
 Feel free to add screenshots and/or videos. These can be very helpful!
 
-If you can, include a complete working example that demonstrates the bug. Please check it can run without modifications.
+If you can, include a complete working example that demonstrates the bug. Check it can run without modifications.