README update

README.md

@@ -5,7 +5,7 @@ Free software to submit charity Gift Aid claims.
 
 # Installation
 
-Package downloads are available for Windows and Max OS X. Check /packages.
+Package downloads are available for Windows and Max OS X. Check [releases](https://github.com/webcollective/Gift-Aid-O-Matic/releases).
 
 # Usage
 
@@ -17,12 +17,16 @@ You can add adjustments for previous overclaims before submitting your claim.
 
 No data is sent to servers other than HMRC's at any stage.
 
+# Technical
+
+Gift-Aid-O-Matic is developed using [TideSDK](http://www.tidesdk.com/). It uses HTML/Javascript for the interface and to build and submit the XML files, and Ruby to sign them for HMRC.
+
 # Limitations
 
-Gift-Aid-O-Matic does not currently support GASDS claims, or the inclusion of Other Income in your submission.
+Gift-Aid-O-Matic does not yet support GASDS claims, sponsored event claims, or the inclusion of Other Income in submissions.
 
 # Contributing
 
-Contributions are welcome: please send a pull request. For security reasons please DO NOT commit your binary packages for OS X or Windows.
+Contributions are welcome: please send a pull request. For security reasons please do not commit your binary packages.