Increase codecov target requirement to 50% (from 40%) (#1344)
Increase codecov target requirement to 50% (from 40%) (#1344)

It looks like our code coverage is above 50% now. Let's
make it a requirement to prevent it from regress.

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