Change the style from flat to regular for consistency. (#866)
Change the style from flat to regular for consistency. (#866)

The current badge styles have 4 flat and 1 regular, which were
rather inconsistent. This fix changes to one style and matches
with Caddy.

Signed-off-by: Yong Tang <765086fe2e0c1f980161f127fec596800f327f62@outlook.com>
yongtang/coredns,johnbelamaric/coredns,miekg/coredns,chrisohaver/coredns,johnbelamaric/coredns,ii/coredns,coredns/coredns,jremond/coredns,miekg/coredns,ii/coredns,jremond/coredns