Finish last change to package keywords

* dash-functional.el: Keep package headers consistent with dash.el.
* dash.el (dash): Reconcile defgroup :groups with package keywords.
* readme-template.md: Remove Emacs package keywords header from
license.
* README.md: Regenerate.

README.md

@@ -3118,7 +3118,6 @@ assign copyright to the Free Software Foundation.
 Copyright (C) 2012-2016 Free Software Foundation, Inc.
 
 Authors: Magnar Sveen <magnars@gmail.com>
-Keywords: lists
 
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by

dash-functional.el

@@ -6,7 +6,7 @@
 ;;          Magnar Sveen <magnars@gmail.com>
 ;; Version: 1.2.0
 ;; Package-Requires: ((dash "2.0.0") (emacs "24"))
-;; Keywords: lisp functions combinators
+;; Keywords: extensions, lisp
 
 ;; This program is free software; you can redistribute it and/or modify
 ;; it under the terms of the GNU General Public License as published by

dash.el

@@ -40,7 +40,8 @@
     (require 'cl)))
 
 (defgroup dash ()
-  "Customize group for dash.el"
+  "Customize group for Dash, a modern list library."
+  :group 'extensions
   :group 'lisp
   :prefix "dash-")
 

readme-template.md

@@ -310,7 +310,6 @@ assign copyright to the Free Software Foundation.
 Copyright (C) 2012-2016 Free Software Foundation, Inc.
 
 Authors: Magnar Sveen <magnars@gmail.com>
-Keywords: lists
 
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by