Added v3.0.3 to the changelog

docs/Changelog.md

@@ -1,3 +1,10 @@
+## v3.0.3
+
+Released June 27, 2015
+
+- `New` Skip duplicates on upload (#367, [How to activate](settings.md))
+- `Fixed` Clicks not recognized when using a mouse on a touchscreen-device #345
+
 ## v3.0.2
 
 Released June 13, 2015