readme: Remove "in progress" etc.

The API could still change, but I'm pretty happy about the current state.

Author: bep

README.md

@@ -3,8 +3,6 @@
 [![codecov](https://codecov.io/github/bep/lazycache/branch/main/graph/badge.svg?token=HJCUCT07CH)](https://codecov.io/github/bep/lazycache)
 [![GoDoc](https://godoc.org/github.com/bep/lazycache?status.svg)](https://godoc.org/github.com/bep/lazycache)
 
-**Note:** This is still a work in progress and the API will most likely change.
-
 **Lazycache** is a simple thread safe in-memory LRU cache. Under the hood it leverages the great [simpleru package in golang-lru](https://github.com/hashicorp/golang-lru), with its exellent performance. One big difference between `golang-lru` and this library is the [GetOrCreate](https://pkg.go.dev/github.com/bep/lazycache#Cache.GetOrCreate) method, which provides: 
 
 * Non-blocking cache priming on cache misses. 
@@ -13,6 +11,7 @@
 
 Other notable features:
 
+* The API is [generic](https://go.dev/doc/tutorial/generics)
 * The cache can be [resized](https://pkg.go.dev/github.com/bep/lazycache#Cache.Resize) while running.
 * When the number of entries overflows the defined cache size, the least recently used item gets discarded (LRU).