[skip travis] Update bug report template.

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,31 +1,18 @@
----
-name: Bug report
-about: Found a bug?  Please report it if it hasn't already been filed...
-title: ''
-labels: ''
-assignees: ''
+## Describe the bug
+A clear and concise description of what the bug is and what the expected behaviour was.
 
----
+## To reproduce
+Steps on how to reproduce the behaviour:
+1. Go to ...
+2. See error
 
-**Describe the bug**
-A clear and concise description of what the bug is.
-
-**To Reproduce**
-Steps to reproduce the behavior:
-1. Go to '...'
-2. Click on '....'
-3. Scroll down to '....'
-4. See error
-
-**Expected behavior**
-A clear and concise description of what you expected to happen.
-
-**Screenshots**
+## Screenshots
 If applicable, add screenshots to help explain your problem.
 
-**Desktop (please complete the following information):**
- - OS
- - Terminal that you're using
- 
-**Additional context**
-If there's any additional information not fitting in the above fields relating to this problem, state it here.
+## Platform
+Provide information on:
+- OS:
+- Terminal
+
+## Additional context
+If anything hasn't been covered by the above categories, state it down here.