fix 0.5.2 announcement date

README.md

@@ -55,7 +55,7 @@ If you notice some bugs, or need to help finding a better solution in your proce
 * 15.08.15 [0.5.4](https://github.com/sourcejs/Source/releases/tag/0.5.4) and  [0.5.4-no-jsdom](https://github.com/sourcejs/Source/releases/tag/0.5.4-no-jsdom) with middleware loader, relative paths in navigation support and other improvements
 * 28.05.15 [0.5.3](https://github.com/sourcejs/Source/releases/tag/0.5.3) context options support, source-as-npm package, CI integration, watcher stability improvements and other great features
 * 28.05.15 [0.5.3-no-jsdom](https://github.com/sourcejs/Source/releases/tag/0.5.3-no-jsdom) special release without JSDom for Windows users
-* 28.03.15 [0.5.2](https://github.com/sourcejs/Source/releases/tag/0.5.2) patch release with improved markdown support and `index.src.html`
+* 15.04.15 [0.5.2](https://github.com/sourcejs/Source/releases/tag/0.5.2) patch release with improved markdown support and `index.src.html`
 * 28.03.15 [0.5.1](https://github.com/sourcejs/Source/releases/tag/0.5.1) patch release with EJS pre-rendering and various bugfixes
 * 28.03.15. SourceJS [Bootstrap example bundle](https://github.com/sourcejs/example-bootstrap-bundle) and [How-to articles blog](https://github.com/sourcejs/blog-howto)
 * 15.03.15. New example [Specs showcase](http://sourcejs.com/specs/) ([source code](https://github.com/sourcejs/example-specs-showcase))