Fix import path github.com/miekg/coredns -> github.com/coredns/coredns (#547)

This fix fixes import path from
`github.com/miekg/coredns`
->
`github.com/coredns/coredns`

middleware/pkg/replacer/replacer.go

@@ -5,8 +5,8 @@ import (
 	"strings"
 	"time"
 
-	"github.com/miekg/coredns/middleware/pkg/dnsrecorder"
-	"github.com/miekg/coredns/request"
+	"github.com/coredns/coredns/middleware/pkg/dnsrecorder"
+	"github.com/coredns/coredns/request"
 
 	"github.com/miekg/dns"
 )

middleware/pkg/response/typify_test.go

@@ -3,7 +3,7 @@ package response
 import (
 	"testing"
 
-	"github.com/miekg/coredns/middleware/test"
+	"github.com/coredns/coredns/middleware/test"
 
 	"github.com/miekg/dns"
 )

middleware/pkg/tls/tls_test.go

@@ -4,7 +4,7 @@ import (
 	"path/filepath"
 	"testing"
 
-	"github.com/miekg/coredns/middleware/test"
+	"github.com/coredns/coredns/middleware/test"
 )
 
 func getPEMFiles(t *testing.T) (rmFunc func(), cert, key, ca string) {