Convert to terraform 0.12

[uchiumih]

I fixed a missing conversion of old code to Terraform 0.12.

[uchiumih]

I got this warning before fix.

Warning: Quoted references are deprecated

  on .terraform/modules/github_webhooks/main.tf line 24, in resource "github_repository_webhook" "default":
  24:     ignore_changes = ["configuration[0].secret"]

In this context, references are expected literally rather than in quotes.
Terraform 0.11 and earlier required quotes, but quoted references are now
deprecated and will be removed in a future version of Terraform. Remove the
quotes surrounding this reference to silence this warning.

[maximmi]

@uchiumih please, rebase PR

[maximmi]

/codefresh run test

[maximmi]

@uchiumih please, rebase PR

[osterman]

/test all

[osterman]

This has been fixed in #18

Thanks for opening the PR! We had some tests that needed fixing for me to get this to work