Prepare for 2.9.1 release

Author: gsherwood

package.xml

@@ -14,8 +14,8 @@ http://pear.php.net/dtd/package-2.0.xsd">
   <email>[email protected]</email>
   <active>yes</active>
  </lead>
- <date>2017-05-04</date>
- <time>09:30:00</time>
+ <date>2017-05-22</date>
+ <time>12:41:00</time>
  <version>
   <release>2.9.1</release>
   <api>2.9.1</api>
@@ -2453,6 +2453,23 @@ http://pear.php.net/dtd/package-2.0.xsd">
   </filelist>
  </phprelease>
  <changelog>
+  <release>
+   <version>
+    <release>2.9.1</release>
+    <api>2.9.1</api>
+   </version>
+   <stability>
+    <release>stable</release>
+    <api>stable</api>
+   </stability>
+   <date>2017-05-22</date>
+   <license uri="https://github.com/squizlabs/PHP_CodeSniffer/blob/master/licence.txt">BSD License</license>
+   <notes>
+    - Fixed bug #1442 : T_NULLABLE detection not working for nullable parameters and return type hints in some cases
+    - Fixed bug #1448 : Generic.Classes.OpeningBraceSameLine doesn't detect comment before opening brace
+      -- Thanks to Juliette Reinders Folmer for the patch
+    </notes>
+  </release>
   <release>
    <version>
     <release>2.9.0</release>