Update ---bug-report.md

Author: lilingxi01

.github/ISSUE_TEMPLATE/---bug-report.md

@@ -7,32 +7,35 @@ assignees: ''
 
 ---
 
-**Describe the bug**
+# Describe the bug:
 A clear and concise description of what the bug is.
 
-**To Reproduce**
+# To Reproduce:
 Steps to reproduce the behavior:
 1. Go to '...'
 2. Click on '....'
 3. Scroll down to '....'
 4. See error
 
-**Expected behavior**
+# Expected behavior:
 A clear and concise description of what you expected to happen.
 
-**Screenshots**
+# Screenshots:
 If applicable, add screenshots to help explain your problem.
 
-**Desktop (please complete the following information):**
+# Desktop (please complete the information):
+<!-- Fill them only when applicable, you can delete this section if your problem does not related to a client issue -->
  - OS: [e.g. iOS]
  - Browser [e.g. chrome, safari]
- - Version [e.g. 22]
 
-**(OR) Smartphone (please complete the following information):**
+# (OR) Smartphone (please complete the information):
+<!-- Fill them only when applicable, you can delete this section if your problem does not related to a client issue -->
  - Device: [e.g. iPhone6]
  - OS: [e.g. iOS8.1]
  - Browser [e.g. stock browser, safari]
- - Version [e.g. 22]
 
-**Additional context**
+# Version:
+[e.g. 22]
+
+# Additional context:
 Add any other context about the problem here.