refine bug report template

Author: Snawoot

.github/ISSUE_TEMPLATE/bug_report.md

@@ -14,28 +14,17 @@ type: Bug
 A clear and concise description of what the bug is.
 
 **To Reproduce**
-Steps to reproduce the behavior:
-1. Go to '...'
-2. Click on '....'
-3. Scroll down to '....'
-4. See error
+Steps to reproduce the behavior.
 
 **Expected behavior**
 A clear and concise description of what you expected to happen.
 
 **Screenshots**
 If applicable, add screenshots to help explain your problem.
 
-**Desktop (please complete the following information):**
- - OS: [e.g. iOS]
- - Browser [e.g. chrome, safari]
- - Version [e.g. 22]
-
-**Smartphone (please complete the following information):**
- - Device: [e.g. iPhone6]
- - OS: [e.g. iOS8.1]
- - Browser [e.g. stock browser, safari]
- - Version [e.g. 22]
+**System (please complete the following information):**
+ - OS: [e.g. Linux]
+ - Version [can be retrieved from `dumbproxy -version` output, e.g. v1.34.0]
 
 **Additional context**
 Add any other context about the problem here.