Update README.md

Remove go1.18 notice. Has been released long enough now, it's not really needed anymore.

README.md

@@ -8,8 +8,6 @@ See also:
 - https://cschleiden.dev/blog/2022-02-13-go-workflows-part1/
 - https://cschleiden.dev/blog/2022-05-02-go-workflows-part2/
 
-On Go support: the current version of the library requires **Go 1.18** or later. There is a version that doesn't require generics and relies more on `interface{}` instead, but I think the improved type safety is worth not supporting a version of Go before 1.18 for now.
-
 ## Docs
 
 See http://cschleiden.github.io/go-workflows for the current version of the documentation.
@@ -107,4 +105,4 @@ func main() {
 	signal.Notify(c2, os.Interrupt)
 	<-c2
 }
-```
+```