Update README again (#319)

There's a rule for when a branch is merged for factory_bot.
I tried removing `[ci-skip]` from the original workflow
to trigger all CI actions. It didn't work, still got the same error:

```
remote: error: GH006: Protected branch update failed for refs/heads/main.
remote: error: Required status check "Run standard" is expected.
To https://github.com/thoughtbot/factory_bot.git
 ! [remote rejected] main -> main (protected branch hook declined)
```

Gonna try going through the PR workflow to see if the rule
gets happy.

README.md

@@ -94,4 +94,5 @@ under the terms specified in the [LICENSE] file.
 [LICENSE]: /LICENSE
 
 <!-- START /templates/footer.md -->
+
 <!-- END /templates/footer.md -->