feat(isMobilePhone): change the german prefix from '+490' to '+49' or '0' #1679
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This would fix #1670
As described mobile phone numbers in Germany start with a 0 prefix such as 0157xxxxxxx. However the preceding 0 is dropped if the country code prefix +49 is added. Therefore I restrict the regex to +49 or 0 and no +490.
I adjusted the tests and added a '0' as validation to '15123456789'.
Examples
invalid:
'15123456789'
valid:
'+4915123456789'
'015123456789'
Checklist