Bump version to 5.0.0

Changes include:

* BREAKING: Handle ES2018 capture names: #247
* BREAKING: Enable `namespacing` feature by default: #316
* BREAKING: Remove Unicode Blocks addon: 4860122
* restore perf tweak that made a meaningful difference in regex construction perf tests: 5f18261
* XRegExp.exec: preserve groups obj that comes from native ES2018 named capture: c4a83e7
* Make XRegExp.exec set groups prop to undefined if there are no named captures (closes #320): 7fea476
* Support optional 'Script=' prefix (from ES2018 syntax) for Unicode script tokens (#225): bb35ead
* XRegExp.matchRecursive: Add delimiter and pos info when unbalanced delimiters are found (closes #293): 9660b90
* XRegExp.escape: Escape whitespace in a way that works with ES6 flag u (fixes #197): e22a52b

To generate this commit, I adapted the steps at #205 (comment)

Here's a fuller list of changes that can be needed with new releases:

> * Version number
>   * Update version number and year in headers, config files, README.
>   * Update version number in `XRegExp.version`.
> * Publish
>   * Publish new git tag. E.g.:
>     * `git tag -a v3.1.0 -m "Release 3.1.0"`.
>     * `git push origin v3.1.0`.
>   * `npm publish`.

README.md

@@ -1,4 +1,4 @@
-# XRegExp 4.4.1-next
+# XRegExp 5.0.0-next
 
 [![Build Status](https://github.com/slevithan/xregexp/workflows/Node.js%20CI/badge.svg)](https://github.com/slevithan/xregexp/actions)
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "xregexp",
-  "version": "4.4.1",
+  "version": "5.0.0",
   "description": "Extended regular expressions",
   "homepage": "http://xregexp.com/",
   "author": "Steven Levithan <[email protected]>",

src/addons/build.js

@@ -1,5 +1,5 @@
 /*!
- * XRegExp.build 4.4.1
+ * XRegExp.build 5.0.0
  * <xregexp.com>
  * Steven Levithan (c) 2012-present MIT License
  */

src/addons/matchrecursive.js

@@ -1,5 +1,5 @@
 /*!
- * XRegExp.matchRecursive 4.4.1
+ * XRegExp.matchRecursive 5.0.0
  * <xregexp.com>
  * Steven Levithan (c) 2009-present MIT License
  */

src/addons/unicode-base.js

@@ -1,5 +1,5 @@
 /*!
- * XRegExp Unicode Base 4.4.1
+ * XRegExp Unicode Base 5.0.0
  * <xregexp.com>
  * Steven Levithan (c) 2008-present MIT License
  */

src/addons/unicode-categories.js

@@ -1,5 +1,5 @@
 /*!
- * XRegExp Unicode Categories 4.4.1
+ * XRegExp Unicode Categories 5.0.0
  * <xregexp.com>
  * Steven Levithan (c) 2010-present MIT License
  * Unicode data by Mathias Bynens <mathiasbynens.be>

src/addons/unicode-properties.js

@@ -1,5 +1,5 @@
 /*!
- * XRegExp Unicode Properties 4.4.1
+ * XRegExp Unicode Properties 5.0.0
  * <xregexp.com>
  * Steven Levithan (c) 2012-present MIT License
  * Unicode data by Mathias Bynens <mathiasbynens.be>

src/addons/unicode-scripts.js

@@ -1,5 +1,5 @@
 /*!
- * XRegExp Unicode Scripts 4.4.1
+ * XRegExp Unicode Scripts 5.0.0
  * <xregexp.com>
  * Steven Levithan (c) 2010-present MIT License
  * Unicode data by Mathias Bynens <mathiasbynens.be>

src/xregexp.js

@@ -1,5 +1,5 @@
 /*!
- * XRegExp 4.4.1
+ * XRegExp 5.0.0
  * <xregexp.com>
  * Steven Levithan (c) 2007-present MIT License
  */
@@ -646,7 +646,7 @@ XRegExp.prototype = new RegExp();
  * @memberOf XRegExp
  * @type String
  */
-XRegExp.version = '4.4.1';
+XRegExp.version = '5.0.0';
 
 // ==--------------------------==
 // Public methods