updated isBetween function to work better

src/ussd_clinic_rapidpro.js

@@ -650,7 +650,7 @@ go.app = function() {
                             "Enter the day that baby was born as a number. For example if baby was born on 12th May, type in 12"
                         ].join("\n"));
                     }
-                    if (!date.isBetween(current_date.clone().add(-2, "years")) && (!date.isSame(current_date, date)) ) {
+                    if (!date.isBetween(current_date.clone().add(-2, "years"), current_date.add(1, "days")) ) {
                         return $(
                             "Unfortunately MomConnect doesn't send messages to children older " +
                             "than 2 years. Please try again by entering the day the baby was " +