CI badge in README

README.md

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-# capybara-lockstep
+# capybara-lockstep [![Tests](https://github.com/makandra/capybara-lockstep/actions/workflows/test.yml/badge.svg)](https://github.com/makandra/capybara-lockstep/actions)
 
 This Ruby gem synchronizes [Capybara](https://github.com/teamcapybara/capybara) commands with client-side JavaScript and AJAX requests. This greatly improves the stability of an end-to-end ("E2E") test suite, even if that suite has timing issues.