chore: tweak issue templates

This will make it easier to know where to type, so people know to leave
a newline before their answer.

Author: silvenon

.github/ISSUE_TEMPLATE/bug-report.md

@@ -5,7 +5,13 @@ about: Something isn't working as expected.
 
 > What is the current behavior?
 
+<!-- ... -->
+
 > What is the expected behavior?
 <!-- If your use case is complicated, please be as descriptive as possible. -->
 
+<!-- ... -->
+
 > Could you provide a [CodeSandbox](https://codesandbox.io/) demo reproducing the bug?
+
+<!-- ... -->

.github/ISSUE_TEMPLATE/feature-request.md

@@ -4,3 +4,5 @@ about: I have a suggestion on how to improve the library.
 ---
 
 > What would you like improved?
+
+<!-- ... -->