Update to match new CoreDNS version

Closes #6

alias.go

@@ -1,12 +1,12 @@
 package alias
 
 import (
+	"context"
+	"math"
+
 	"github.com/coredns/coredns/plugin"
 
 	"github.com/miekg/dns"
-	"math"
-
-	"golang.org/x/net/context"
 )
 
 // Rewrite is plugin to rewrite requests internally before being handled.

coredns/go.mod

@@ -5,7 +5,7 @@ go 1.13
 replace github.com/serverwentdown/alias => ../
 
 require (
-	github.com/coredns/coredns v1.6.9
-	github.com/miekg/dns v1.1.29
+	github.com/coredns/coredns v1.8.1
+	github.com/miekg/dns v1.1.35
 	github.com/serverwentdown/alias v0.0.0-00010101000000-000000000000
 )

go.mod

@@ -1,10 +1,9 @@
 module github.com/serverwentdown/alias
 
-go 1.13
+go 1.15
 
 require (
-	github.com/caddyserver/caddy v1.0.5
-	github.com/coredns/coredns v1.6.9
-	github.com/miekg/dns v1.1.29
-	golang.org/x/net v0.0.0-20200301022130-244492dfa37a
-)
+	github.com/coredns/caddy v1.1.0
+	github.com/coredns/coredns v1.8.1
+	github.com/miekg/dns v1.1.35
+)

ready.go

@@ -0,0 +1,3 @@
+package alias
+
+func (al Alias) Ready() bool { return true }

setup.go

@@ -1,18 +1,12 @@
 package alias
 
 import (
+	"github.com/coredns/caddy"
 	"github.com/coredns/coredns/core/dnsserver"
 	"github.com/coredns/coredns/plugin"
-
-	"github.com/caddyserver/caddy"
 )
 
-func init() {
-	caddy.RegisterPlugin("alias", caddy.Plugin{
-		ServerType: "dns",
-		Action:     setup,
-	})
-}
+func init() { plugin.Register("alias", setup) }
 
 func setup(c *caddy.Controller) error {
 	c.Next()

setup_test.go

@@ -0,0 +1,19 @@
+package alias
+
+import (
+	"testing"
+
+	"github.com/coredns/caddy"
+)
+
+func TestSetup(t *testing.T) {
+	c := caddy.NewTestController("dns", `alias`)
+	if err := setup(c); err != nil {
+		t.Fatalf("Expected no errors, but got: %v", err)
+	}
+
+	c = caddy.NewTestController("dns", `alias more`)
+	if err := setup(c); err == nil {
+		t.Fatalf("Expected errors, but got: %v", err)
+	}
+}