Update bug_report.md

updating the bug template to include the "actual behavior" section

Author: stechkev

.github/ISSUE_TEMPLATE/bug_report.md

@@ -17,6 +17,9 @@ Steps to reproduce the behavior:
 **Expected behavior**
 A clear and concise description of what you expected to happen.
 
+**Actual behavior**
+A clear and concise description of what is currently happening.
+
 **Screenshots**
 If applicable, add screenshots to help explain your problem.