timezone data: update to 2020a
timezone data: update to 2020a

Update timezone data to 2020a

http://mm.icann.org/pipermail/tz-announce/2020-April/000058.html

2020a:
    Morocco springs forward on 2020-05-31, not 2020-05-24.
    Canada's Yukon advanced to -07 year-round on 2020-03-08.
    America/Nuuk renamed from America/Godthab.

Signed-off-by: Hannu Nyman <ab53a3387de93e31696058c104e6f769cd83fd1b@iki.fi>

hnyman/luci,hnyman/luci,lbthomsen/openwrt-luci,rogerpueyo/luci,openwrt/luci,hnyman/luci,openwrt/luci,hnyman/luci,lbthomsen/openwrt-luci,openwrt/luci,lbthomsen/openwrt-luci,lbthomsen/openwrt-luci,hnyman/luci,lbthomsen/openwrt-luci,openwrt/luci,openwrt/luci,openwrt/luci,lbthomsen/openwrt-luci,rogerpueyo/luci,openwrt/luci,rogerpueyo/luci,rogerpueyo/luci,rogerpueyo/luci,lbthomsen/openwrt-luci,rogerpueyo/luci,hnyman/luci,openwrt/luci,rogerpueyo/luci,lbthomsen/openwrt-luci,hnyman/luci,hnyman/luci,rogerpueyo/luci