style(github/issue-template): bold headings

Author: mihar-22

.github/ISSUE_TEMPLATE.md

@@ -46,14 +46,11 @@ tutorial to learn how: http://kcd.im/pull-request
 - `node` version:
 - `npm` (or `yarn`) version:
 
-Relevant code or config
+**Relevant code or config**
 
-```javascript
-```
+**What you did:**
 
-What you did:
-
-What happened:
+**What happened:**
 
 <!-- Please provide the full error message/screenshots/anything -->