Add standalone changelog file

CHANGELOG.md

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+# Changelog
+
+## Version 2.4.0:
+
+-   Added Typescript definitions. – Thanks to @danhab99 for creating
+-   Added SECURITY.md policy and CodeQL scanning
+
+## Version 2.3.0:
+
+-   Fixed bug where if the user-agent passed to `isAllowed()` / `isDisallowed()` is called "constructor" it would throw an error.
+-   Added support for relative URLs. This does not affect the default behavior so can safely be upgraded.
+
+    Relative matching is only allowed if both the robots.txt URL and the URLs being checked are relative.
+
+    For example:
+
+    ```js
+    var robots = robotsParser('/robots.txt', [
+        'User-agent: *',
+        'Disallow: /dir/',
+        'Disallow: /test.html',
+        'Allow: /dir/test.html',
+        'Allow: /test.html'
+    ].join('\n'));
+
+    robots.isAllowed('/test.html', 'Sams-Bot/1.0'); // false
+    robots.isAllowed('/dir/test.html', 'Sams-Bot/1.0'); // true
+    robots.isDisallowed('/dir/test2.html', 'Sams-Bot/1.0'); // true
+    ```
+
+## Version 2.2.0:
+
+-   Fixed bug that with matching wildcard patterns with some URLs
+    – Thanks to @ckylape for reporting and fixing
+-   Changed matching algorithm to match Google's implementation in google/robotstxt
+-   Changed order of precedence to match current spec
+
+## Version 2.1.1:
+
+-   Fix bug that could be used to causing rule checking to take a long time
+    – Thanks to @andeanfog
+
+## Version 2.1.0:
+
+-   Removed use of punycode module API's as new URL API handles it
+-   Improved test coverage
+-   Added tests for percent encoded paths and improved support
+-   Added `getMatchingLineNumber()` method
+-   Fixed bug with comments on same line as directive
+
+## Version 2.0.0:
+
+This release is not 100% backwards compatible as it now uses the new URL APIs which are not supported in Node < 7.
+
+-   Update code to not use deprecated URL module API's.
+    &ndash; Thanks to @kdzwinel
+
+## Version 1.0.2:
+
+-   Fixed error caused by invalid URLs missing the protocol.
+
+## Version 1.0.1:
+
+-   Fixed bug with the "user-agent" rule being treated as case sensitive.
+    &ndash; Thanks to @brendonboshell
+-   Improved test coverage.
+    &ndash; Thanks to @schornio
+
+## Version 1.0.0:
+
+-   Initial release.