Update pickadate to v3.0.5

There is a small upstream update to pickadate that only contains two fixes - listed below.

https://github.com/amsul/pickadate.js/issues/145
https://github.com/amsul/pickadate.js/pull/137

The first one (145) is the important one as it includes a fix for a missing function which results in an error.  I've updated the relevant files here accordingly.  

Hope this is helpful - please let me know if there are any changes I should make in order to ensure this PR has what's needed.

Thanks!