get_os_version_major assumes two dots in version number

[aysiu]

The code here to get the OS major version:
https://github.com/erikng/nudge/blob/master/payload/Library/nudge/Resources/nudge#L131-L134

def get_os_version_major():
    '''Return major OS version.'''
    full_os = platform.mac_ver()[0]
    return LooseVersion(full_os.rsplit('.', 1)[0])

assumes that platform.mac_ver()[0] will return something like 10.15.0 instead of 10.15. If it deals with something like 10.15, then the function will return 10.

Re-think the logic to account for both types of scenarios.

[aysiu]

Just confirmed with

full_os = platform.mac_ver()[0]
nudgelog(str(full_os))

That it displays as 10.15 on a 10.15 machine (build 19A603), displays as 10.14.6 on a 10.14.6 machine (build 18G103), and displays as 10.15.2 on a 10.15.2 machine (build 19C57).