Update bug_report.md

.github/ISSUE_TEMPLATE/bug_report.md

@@ -16,6 +16,10 @@ A clear and concise description of what you expected to happen.
 **Screenshots**
 If applicable, add screenshots to help explain your problem.
 
+**Error Message**
+
+`<The error message in terminal>`
+
 **Desktop (please complete the following information):**
  - OS: [e.g. Windows]
  - Version [e.g. 22]