Bump version to 1.4.0 ahead of tag

Author: rtheunissen

package.xml

@@ -16,21 +16,19 @@
         <email>[email protected]</email>
         <active>yes</active>
     </lead>
-    <date>2020-10-13</date>
-    <time>21:24:19</time>
+    <date>2021-12-13</date>
+    <time>10:20:14</time>
     <version>
-        <release>1.3.0</release>
-        <api>1.3.0</api>
+        <release>1.4.0</release>
+        <api>1.4.0</api>
     </version>
     <stability>
         <release>stable</release>
         <api>stable</api>
     </stability>
     <license uri="https://opensource.org/licenses/MIT">MIT License</license>
     <notes>
-        - ArrayAccess implemented consistently
-        - IteratorAggregate implemented consistently
-        - A few incorrect return types
+        - Support for PHP 8.1
     </notes>
     <contents>
         <dir name="/">

php_ds.h

@@ -20,7 +20,7 @@ extern zend_module_entry ds_module_entry;
 #define phpext_ds_ptr &ds_module_entry
 
 /* Replace with version number for your extension */
-#define PHP_DS_VERSION "1.3.0"
+#define PHP_DS_VERSION "1.4.0"
 
 #ifdef PHP_WIN32
 #  define PHP_API __declspec(dllexport)