docs: typo

Author: drlkf

README.md

@@ -1,4 +1,4 @@
 # fused-effects-logger
-A logger effects for the
+A logger effect for the
 [`fused-effects`](https://github.com/fused-effects/fused-effects) library, based
 on the [`monad-logger`](https://github.com/snoyberg/monad-logger) API.