Release Dash 2.19.0

* dash.el: Bump to version 2.19.0.
* README.md:
* dash.texi: Regenerate docs.

Closes #382.

README.md

@@ -56,7 +56,7 @@ Libraries")`](https://gnu.org/software/emacs/manual/html_node/emacs/Lisp-Librari
 
 Add something like this to the library's headers:
 
-    ;; Package-Requires: ((dash "2.18.1"))
+    ;; Package-Requires: ((dash "2.19.0"))
 
 See [`(info "(elisp) Library
 Headers")`](https://gnu.org/software/emacs/manual/html_node/elisp/Library-Headers.html).

dash.el

@@ -3,7 +3,7 @@
 ;; Copyright (C) 2012-2021 Free Software Foundation, Inc.
 
 ;; Author: Magnar Sveen <magnars@gmail.com>
-;; Version: 2.18.1
+;; Version: 2.19.0
 ;; Package-Requires: ((emacs "24"))
 ;; Keywords: extensions, lisp
 ;; Homepage: https://github.com/magnars/dash.el

dash.texi

@@ -1,7 +1,7 @@
 \input texinfo    @c -*- texinfo -*-
 @c %**start of header
 @setfilename dash.info
-@set DASHVER 2.18.1
+@set DASHVER 2.19.0
 @settitle Dash: A modern list library for GNU Emacs.
 @documentencoding UTF-8
 @documentlanguage en