Fix Typo [skip ci]

Author: kazlauskis

.github/ISSUE_TEMPLATE/bug_report.md

@@ -11,13 +11,13 @@ assignees: ''
 A clear and concise description of what the issue is.
 
 **To Reproduce**
-Steps to reproduce the behavior:
+Steps to reproduce the behaviour:
 1. Go to '...'
 2. Click on '....'
 3. Scroll down to '....'
 4. See error
 
-**Expected behavior**
+**Expected behaviour**
 A clear and concise description of what you expected to happen.
 
 **Screenshots**