Update Delphi Version Features page

Author: delphidabbler

notes/version-features.html

@@ -213,6 +213,10 @@ <h1>Delphi Version Features</h1>
                     <td><var>AnsiString</var> replaces <var>ShortString</var> as the default string type<sup><a href="#footnote-6" title="Source: StackOverflow">6</a>,<a href="#footnote-7">7</a></sup>.</td>
                     <td>Delphi 2</td>
                 </tr>
+                <tr>
+                    <td><var>System.AnsiStrings</var> unit introduced</td>
+                    <td>Delphi XE4</td>
+                </tr>
                 <tr>
                     <td>Atomic intrinsic functions <var>AtomicExchange</var>, <var>AtomicIncrement</var>, <var>AtomicCmpExchange</var> &amp; <var>AtomicDecrement</var><a href="#footnote-6" title="Source: StackOverflow"><sup>6</sup></a></td>
                     <td>Delphi XE3</td>