Update package.xml with 1.4.0 information

Author: Jeckerson

package.xml

@@ -12,20 +12,21 @@
         <email>anton@phalcon.io</email>
         <active>yes</active>
     </lead>
-    <date>2021-09-15</date>
-    <time>22:00:00</time>
+    <date>2021-09-18</date>
+    <time>11:00:00</time>
     <version>
-        <release>1.3.9</release>
-        <api>1.3.9</api>
+        <release>1.4.0</release>
+        <api>1.4.0</api>
     </version>
     <stability>
         <release>stable</release>
         <api>stable</api>
     </stability>
     <license uri="https://github.com/zephir-lang/php-zephir-parser/blob/development/LICENSE">MIT</license>
     <notes>
-        ## Added
-        * Added `package.xml` file for pecl releases.
+        ### Added
+        - Added support for `mixed` type [#120](https://github.com/phalcon/php-zephir-parser/issues/120)
+        - Add support for `yield` statement [#118](https://github.com/phalcon/php-zephir-parser/issues/118)
     </notes>
     <contents>
         <dir name="/">