Update docs: Splitflap no longer “in progress”

Author: otherjoel

README.md

@@ -1,6 +1,6 @@
 # `splitflap` [![Contributor Covenant](https://img.shields.io/badge/Contributor%20Covenant-2.0-4baaaa.svg)](CODE_OF_CONDUCT.md)
 
-🔖⚛️ RSS / Atom feed generation library for Racket. **Still in progress**
+🔖⚛️ RSS / Atom feed generation library for Racket.
 
 Everything you supply is validated, so the result is always either a valid feed or an exception.
 

splitflap-doc/notes.scrbl

@@ -1,8 +1,12 @@
 #lang scribble/manual
 
-@(require "misc.rkt" (for-label splitflap xml))
+@(require "misc.rkt"
+          splitflap/private/version
+          (for-label splitflap xml))
 
-@title{Package Notes}
+@title{Package Notes (@splitflap-version[])}
+
+Splitflap can be considered stable. No backward-incompatible changes are planned.
 
 @section{Known Issues}