doc: drop notes about breaking changes

Going forward, we're going to avoid making them.

README.md

@@ -1,8 +1,6 @@
 # gui-easy-lib
 
-Declarative GUIs in Racket.  This is still a work in progress so
-expect some breaking changes.
-
+Declarative GUIs in Racket.
 
 ## Installation
 
@@ -12,7 +10,6 @@ The package is available on the [Racket Package Index][pkg].
 $ raco pkg install gui-easy
 ```
 
-
 ## Development
 
 From the root of the repository:
@@ -29,14 +26,12 @@ From the root of the repository:
 $ raco pkg update gui-easy-lib/ gui-easy/
 ```
 
-
 ## Running the demos
 
 After you have installed `gui-easy-lib`.  You can run the _example
 code_ from the `examples/` folder using _DrRacket_ or via the
 command-line.
 
-
 ## License
 
     gui-easy is licensed under the 3-Clause BSD license.

gui-easy/gui/easy/scribblings/gui-easy.scrbl

@@ -12,8 +12,7 @@
 @author[(author+email "Bogdan Popa" "bogdan@defn.io")]
 
 This library provides a declarative API on top of
-@racketmodname[racket/gui].  This library is still a work in progress,
-so expect some breaking changes.
+@racketmodname[racket/gui].
 
 @(define-runtime-path youtubestub.tex "youtubestub.tex")
 @(define embed-style