Un-prune code-generator scripts

Scripts under code-generator are required to generate code when
snapshot APIs are changed. Therefore they should not be pruned.

Author: xing-yang

Gopkg.lock

@@ -43,3 +43,10 @@ required = [
   non-go = true
   go-tests = true
   unused-packages = true
+  [[prune.project]]
+    # Scripts under code-generator are required to generate code
+    # when snapshot APIs are changed. Therefore they should not
+    # be pruned.
+    name = "k8s.io/code-generator"
+    non-go = false
+    unused-packages = false