Update changelog

Author: ghiscoding

changelog.txt

@@ -1,5 +1,8 @@
 Angular-Validation change logs
 
+1.5.7 (2016-10-03) Add Dutch and Romanian #134
+1.5.6 (2016-09-24) Dates validator now checks for leap year & full date calendar, fix #130
+1.5.5 (2016-09-01) If translation isn't loading & working correctly, it should throw an error.
 1.5.4 (2016-07-29) Fixed an issue with 3rd party validation not triggering a $scope.$watch. Also added new international phone validation (issue #125).
 1.5.3 (2016-07-20) Add C# validation annotation, (for example: maxLen => maxLength)
 1.5.2 (2016-06-14) Fixed #121 Alternate text containing the char ":" was causing unexpected displayed message.