Add stdlib import

Author: uudashr

pkg/golinters/iface/testdata/unused.go

@@ -2,19 +2,21 @@
 //golangcitest:config_path testdata/unused.yml
 package testdata
 
+import "context"
+
 type User struct {
 	ID   string
 	Name string
 }
 
 type UserRepository interface { // want "interface UserRepository is declared but not used within the package"
-	UserOf(id string) (*User, error)
+	UserOf(ctx context.Context, id string) (*User, error)
 }
 
 type UserRepositorySQL struct {
 }
 
-func (r *UserRepositorySQL) UserOf(id string) (*User, error) {
+func (r *UserRepositorySQL) UserOf(ctx context.Context, id string) (*User, error) {
 	return nil, nil
 }