Describe the enhancement
While using the UpdateLocale Plugin, it isn't possible to just update one single value in a nested value.
For example I just want to update the format.L value:

dayjs.extend(UpdateLocale);
dayjs.updateLocale('de', {
  formats: {
    L: 'D.M.YYYY',
  },
});

Like this other formats LL, LLL, ... are getting lost.

Expected behavior
I want

Description of the Issue and Steps to Reproduce:

Did you search for duplicate issue? Yes

Please describe the issue and steps to reproduce, preferably with a code sample / plunker:

Would you like to add ng-add schematics into this repo?

*Ensure your issue is isolated to ngx-moment. Issues involving third party tools will be closed unless submitted by the tool's author/main

I was looking for the format YYYY/MM/DD in the formats object but I didn't find any, isn't this a common format?
in Hijri it would be iYYYY/iMM/iDD

Hi!

Getting the number of days in the month doesn't work.

Method iDaysInMonth() returns value 'NaN'.

Workaround:
Method endOf('iMonth').iDate() return value correctly.