Problem: go 1.22 used

Solution: fix a README and GHA

.github/workflows/go.yml

@@ -13,15 +13,13 @@ jobs:
 
   build:
     runs-on: ubuntu-latest
-    env:
-      GOEXPERIMENT: rangefunc
     steps:
     - uses: actions/checkout@v3
 
     - name: Set up Go
-      uses: actions/setup-go@v4
+      uses: actions/setup-go@v5
       with:
-        go-version: '1.22'
+        go-version: '1.23.0-rc.2'
 
     - name: Build
       run: go build -v ./...

README.md

@@ -12,7 +12,12 @@ chaining of iterator methods impossible. `it` provides a simple helper struct
 
 # Usage
 
-> Don't forget to install go 1.22 and `export GOEXPERIMENT=rangefunc`
+> Don't forget to install go 1.23rc2
+
+```sh
+$ go1.23rc2 get [email protected] [email protected]
+$ export GOTOOLCHAIN=go1.23rc2
+```
 
 ## Filter the slice