rill: update description (#5491)

README.md

@@ -1350,7 +1350,7 @@ _Tools for managing and working with Goroutines._
 - [parallel-fn](https://github.com/rafaeljesus/parallel-fn) - Run functions in parallel.
 - [pond](https://github.com/alitto/pond) - Minimalistic and High-performance goroutine worker pool written in Go.
 - [pool](https://github.com/go-playground/pool) - Limited consumer goroutine or unlimited goroutine pool for easier goroutine handling and cancellation.
-- [rill](https://github.com/destel/rill) - Go concurrency with channel transformations. No boilerplate, type safety, batching and error handling. 
+- [rill](https://github.com/destel/rill) - Go toolkit for clean, composable, channel-based concurrency. 
 - [routine](https://github.com/timandy/routine) - `routine` is a `ThreadLocal` for go library. It encapsulates and provides some easy-to-use, non-competitive, high-performance `goroutine` context access interfaces, which can help you access coroutine context information more gracefully.
 - [routine](https://github.com/x-mod/routine) - go routine control with context, support: Main, Go, Pool and some useful Executors.
 - [semaphore](https://github.com/kamilsk/semaphore) - Semaphore pattern implementation with timeout of lock/unlock operations based on channel and context.