Added Opera as a default browser

Author: Ephellon

.github/ISSUE_TEMPLATE/fail_report.md

@@ -30,7 +30,7 @@ If applicable, add screenshots to help explain your problem.
 **Extension Information**
  - Version: `4.XXXX.YYYY.ZZZZ`
  - Source: `store` `GitHub`
- - Browser: `chrome` `firefox` `edge`
+ - Browser: `chrome` `firefox` `edge` `opera`
 
 **Additional comments**
 Add any other comments about the problem here, such as how often the issue occurs, any new changes, etc.