Doc: add changelog

Promised on SECURITY.md but not present!

CHANGELOG.md

@@ -0,0 +1,24 @@
+# Changelog
+
+For a _much_ more detailed version, see the [commit history] on GitHub.
+
+## 1.0.3
+
+-   Add functioning version check
+-   Move graphics files (for logo, etc.) to `/graphics` (de-clutter root)
+-   Moved style/template changes to `all` since they are not specific to prosilver (merely JS injection)
+-   Add this file :-)
+
+## 1.0.2
+
+-   Semi-broken transitional package; versioning was inconsistent
+
+## 1.0.1
+
+-   First version released to the public
+
+## 1.0.0
+
+-   Internal test code, never released (no tag on GitHub)!
+
+[commit history]: https://github.com/GwynethLlewelyn/post-local-storage/commits/master

SECURITY.md

@@ -14,4 +14,4 @@ Please send them to me [by email](mailto:[email protected]),
 
 Information about the vulnerability is _not_ to be released to a general audience; 
 at least not until it was properly patched _and_ a new release was publicly published,
-in which case it will be announced on (at least) the ChangeLog.
+in which case it will be announced on (at least) the [ChangeLog](CHANGELOG.md).