plugin/minimal: fix import path (#4523)

presubmit failing, fix import path.
Signed-off-by: Miek Gieben <miek@miek.nl>

plugin/minimal/minimal.go

@@ -8,6 +8,7 @@ import (
 	"github.com/coredns/coredns/plugin"
 	"github.com/coredns/coredns/plugin/pkg/nonwriter"
 	"github.com/coredns/coredns/plugin/pkg/response"
+
 	"github.com/miekg/dns"
 )
 

plugin/minimal/minimal_test.go

@@ -7,6 +7,7 @@ import (
 	"github.com/coredns/coredns/plugin"
 	"github.com/coredns/coredns/plugin/pkg/dnstest"
 	"github.com/coredns/coredns/plugin/test"
+
 	"github.com/miekg/dns"
 )