Rename Storable interface to Storer

See https://golang.org/doc/effective_go.html#interface-names

pkg/codegen/assets/store_interfaces_joined.gen.go.tpl

@@ -17,13 +17,13 @@ import (
 )
 
 type (
-	Transactionable interface {
-		Tx(context.Context, func(context.Context, Storable) error) error
+	Transactioner interface {
+		Tx(context.Context, func(context.Context, Storer) error) error
 	}
 
 	// Sortable interface combines interfaces of all supported store interfaces
-	Storable interface {
-		Transactionable
+	Storer interface {
+		Transactioner
 
 	{{ range .Definitions -}}
 		{{ export .Types.Plural }}

pkg/codegen/assets/store_test_all.gen.go.tpl

@@ -18,7 +18,7 @@ import (
 	"testing"
 )
 
-func testAllGenerated(t *testing.T, s store.Storable) {
+func testAllGenerated(t *testing.T, s store.Storer) {
 {{- range . }}
 	// Run generated tests for {{ .Types.Base }}
 	t.Run({{ printf "%q" .Types.Base }}, func(t *testing.T) {