Update bug_report.md

Fix Platform misspelling.

Author: HeIp

Diff for: .github/ISSUE_TEMPLATE/bug_report.md

@@ -24,7 +24,7 @@ A clear and concise description of what you expected to happen.
 If applicable, add screenshots to help explain your problem.
 
 **Desktop (please complete the following information):**
- - Platfrom: [eg. Mac, Windows, Linux]
+ - Platform: [eg. Mac, Windows, Linux]
  - OS: [e.g. MacOS Catalina, Windows 7, Ubuntu]
  - Version [e.g. 10.15.4]