Update the package release notes and date

package.xml

@@ -18,7 +18,7 @@
   <active>yes</active>
  </lead>
  -->
- <date>2022-09-30</date>
+ <date>2022-10-01</date>
  <version>
   <release>2.0.4</release>
   <api>2.0.4</api>
@@ -32,6 +32,7 @@
 * Add `-fvisibility=hidden` to compiler options to reduce compiled extension size by avoiding exporting symbols by default.
 * If the requested json parsing $depth is excessively large when reallocating larger buffers for the C simdjson parser,
   then internally use a smaller $depth that would behave identically with lower memory usage. (#66)
+* Update simdjson to properly reject surrogate pairs with an invalid low surrogate. (https://en.wikipedia.org/wiki/UTF-16)
  </notes>
  <contents>
   <dir name="/">