Update Changelog.txt

Author: jlgager24

Changelog.txt

@@ -1,3 +1,9 @@
+Version 1.3.1.0 changes (4/5/2017):
+* Added FXML Dialog Wrapper
+* JavaDocs documentation is improved
+* Pom file is improved and updated
+* Now hosted on Maven Central
+
 Version 1.3.0.0 changes (3/31/2017):
 * Added MessageBox and Login dialog objects
 * Added Static Class Instantiation Protection
@@ -21,4 +27,4 @@ Version 1.1.0.0 changes (02/18/2017):
 * Finalized JavaDocs. Everything is documented correctly now.
 
 Version 1.0.0.0 changes (02/13/2017):
-* Initial Release
+* Initial Release