Update todos: Shareable day of year for mobile.

Shareable day of the year for mobile (Whatsapp) completed in #46

readme.md

@@ -106,11 +106,11 @@ The development process
 todo: 
 * Provide proper error messages when app/function crashes
 * Add repeating countdowns, Eg: birthdays
-* Shareable day of the year for mobile (Whatsapp)
 * Make use of notifications api to provide alert/notifications when countdown is complete
 * Provide a custom sort of countdowns by due time or date modified
 
 todo v3:
 * authentication (firebase)
 * Shareable links
 * "on this day" feature
+* "How long since this day" feature