Fix changelog formatting

Author: ianfixes

CHANGELOG.md

@@ -53,7 +53,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Added a CI workflow to lint the code base
 - Added a CI workflow to check for spelling errors
 - Extraction of bytes usage in a compiled sketch is now calculated in a method: `ArduinoBackend.last_bytes_usage`
-- Added ```nano_every``` platform to represent ```arduino:megaavr``` architecture
+- Added `nano_every` platform to represent `arduino:megaavr` architecture
 - Working directory is now printed in test runner output
 - Explicitly include `irb` via rubygems