Alexa Lex created LexBot, LexIntent cannot be deleted when the bot has an alias configured

[deekayw0n]

aws-nuke fails to delete LexBot and LexIntent resources when an alias is associated to the bot. Manual removal of the alias in the console or CLI allows it to complete the deletion as expected.

Errors:

us-west-2 - LexBot - testbot - [Name: "testbot", Status: "READY"] - failed
s-west-2 - LexIntent - weather - [Name: "weather"] - failed
ERRO[0030] There are resources in failed state, but none are ready for deletion, anymore. 
us-west-2 - LexBot - testbot - [Name: "testbot", Status: "READY"] - failed
ERRO[0030] ResourceInUseException: 
{
  RespMetadata: {
    StatusCode: 400,
    RequestID: "158d2337-04bb-4cbc-9a66-3d9531241d92"
  },
  ExampleReference: {
    Name: "testerbot"
  },
  ReferenceType: "BotAlias"
} 
us-west-2 - LexIntent - weather - [Name: "weather"] - failed
ERRO[0030] ResourceInUseException: 
{
  RespMetadata: {
    StatusCode: 400,
    RequestID: "d342575f-9b39-46f7-ba13-47293c6cb34b"
  },
  ExampleReference: {
    Name: "testbot",
    Version: "$LATEST"
  },
  ReferenceType: "Bot"
} 
Error: failed

After: aws lex-models delete-bot-alias --name testerbot --bot-name testbot --region us-west-2:

us-west-2 - LexIntent - weather - [Name: "weather"] - removed
us-west-2 - LexBot - testbot - [Name: "testbot", Status: "READY"] - removed

Nuke complete: 0 failed ....