Update README.md

Author: fonsp

README.md

@@ -2,12 +2,12 @@
 
 > _Visual, reactive testing library for Julia_
 
-A macro `@test` that you can use to verify your code's correctness.
-
-**But instead of just saying _"Pass"_ or _"Fail"_, let's try to show you _why_ a test failed.**
+A macro `@test` that you can use to verify your code's correctness. **But instead of just saying _"Pass"_ or _"Fail"_, let's try to show you _why_ a test failed.**
 -   ✨ _time travel_ ✨ to replay the execution step-by-step
 -   ⭐️ _multimedia display_ ⭐️ to make results easy to read
 
+---
+
 ![Demo screencap](https://user-images.githubusercontent.com/6933510/116827035-60f4cf00-ab97-11eb-9dd9-631426e435af.gif)
 
 [Try this demo in your browser](https://juliapluto.github.io/PlutoTest.jl/src/notebook.html)