Add 1.9.1 (#66)

Signed-off-by: Chris O'Haver <[email protected]>

Author: chrisohaver

corefile-tool/cmd/validversions_test.go

@@ -15,7 +15,7 @@ func TestNewValidVersionsCmd(t *testing.T) {
 		{
 			name: "Works without error",
 			expectedOutput: `The following are valid CoreDNS versions:
-1.1.3, 1.1.4, 1.2.0, 1.2.1, 1.2.2, 1.2.3, 1.2.4, 1.2.5, 1.2.6, 1.3.0, 1.3.1, 1.4.0, 1.5.0, 1.5.1, 1.5.2, 1.6.0, 1.6.1, 1.6.2, 1.6.3, 1.6.4, 1.6.5, 1.6.6, 1.6.7, 1.6.9, 1.7.0, 1.7.1, 1.8.0, 1.8.3, 1.8.4, 1.8.5, 1.8.6, 1.8.7, 1.9.0
+1.1.3, 1.1.4, 1.2.0, 1.2.1, 1.2.2, 1.2.3, 1.2.4, 1.2.5, 1.2.6, 1.3.0, 1.3.1, 1.4.0, 1.5.0, 1.5.1, 1.5.2, 1.6.0, 1.6.1, 1.6.2, 1.6.3, 1.6.4, 1.6.5, 1.6.6, 1.6.7, 1.6.9, 1.7.0, 1.7.1, 1.8.0, 1.8.3, 1.8.4, 1.8.5, 1.8.6, 1.8.7, 1.9.0, 1.9.1
 `,
 			expectedError: false,
 		},

migration/versions.go

@@ -30,7 +30,30 @@ type release struct {
 
 // Versions holds a map of plugin/option migrations per CoreDNS release (since 1.1.4)
 var Versions = map[string]release{
+	"1.9.1": {
+		priorVersion:   "1.9.0",
+		dockerImageSHA: "d5a7db9ab4cb3efc22a08707385c54c328db3df32841d6c4a8ae78f102f1f49a",
+		plugins: map[string]plugin{
+			"errors":       plugins["errors"]["v2"],
+			"log":          plugins["log"]["v1"],
+			"health":       plugins["health"]["v1"],
+			"ready":        {},
+			"autopath":     {},
+			"kubernetes":   plugins["kubernetes"]["v8"],
+			"k8s_external": plugins["k8s_external"]["v1"],
+			"prometheus":   {},
+			"forward":      plugins["forward"]["v3"],
+			"cache":        plugins["cache"]["v1"],
+			"loop":         {},
+			"reload":       {},
+			"loadbalance":  {},
+			"hosts":        plugins["hosts"]["v1"],
+			"rewrite":      plugins["rewrite"]["v2"],
+			"transfer":     plugins["transfer"]["v1"],
+		},
+	},
 	"1.9.0": {
+		nextVersion:    "1.9.1",
 		priorVersion:   "1.8.7",
 		dockerImageSHA: "0f101fabf4b63883d4529435f75b1e8816dcc8915e8fa7d28aa6e50a15e9ea6a",
 		plugins: map[string]plugin{