Bug 1541174: Update Readme in regards to IE

This change is necessary because Microsoft
does not support IE9 and IE10 anymore. Thus,
we should not encourage their use.

behatnotneeded

Change-Id: Icc0690237e7fd4740d578266ed6ee033cd8661ed

README

@@ -66,13 +66,17 @@ Mahara 15.04 requires:
 
  * Web Browser: Mahara should be accessible in any modern web browser with
    Javascript support. However, it is only actively tested in the most recent
-   versions of Firefox, Chrome, Safari, and Opera; and the last three versions
-   of IE. For Mahara 15.04, these versions are:
+   versions of Firefox, Chrome, Safari, and Opera; and the Microsoft-supported
+   versions of Internet Explorer (IE). For Mahara 15.04, these versions are:
  ** Firefox - 24.0
  ** Chrome - 34.0
  ** Safari - 6.0
  ** Opera - 17.0
- ** IE - 9, 10, 11
+ ** IE - 11 and Edge
+
+Mahara will still work with Internet Explorer 9 and 10, but we recommend to use a
+supported version of Internet Explorer or a different browser to have all
+functionality available as well as all necessary security updates for the browser.
 
 TRANSLATIONS: You can get language packs from: