Update the change log for 1.5.2 release

Author: treffynnon

README.markdown

@@ -74,6 +74,10 @@ foreach ($tweets as $tweet) {
 Changelog
 ---------
 
+#### 1.5.2 - released 2014-06-23
+
+* Paris incorrectly relying on old Idiorm version in the composer.json [[ilsenem](https://github.com/ilsenem)] - [issue #96](https://github.com/j4mie/paris/pull/96)
+
 #### 1.5.1 - released 2014-06-22
 
 * Remove HHVM build target from travis-ci as there is a bug in HHVM