[BUG] Message Formatting

[razcloud]

Thanks @razcloud! It looks great now.

P.S.: There seems to be a space missing after the "Message" string, but it's a minor thing 😃 .

$ cfn-guard validate -d template.json -r rules.guard
template.json Status = FAIL
FAILED rules
rules.guard/aws_s3_bucket_versioning_defined    FAIL
---
Evaluating data template.json against rules rules.guard
Number of non-compliant resources 1
Resource = WebsiteBucket4326D7C2 {
  Type      = AWS::S3::Bucket
  CDK-Path  = LandingPageFrontend/Website/Bucket/Resource
  Rule = aws_s3_bucket_versioning_defined {
    ALL {
      Check =  VersioningConfiguration EXISTS   {
        Message= VersioningConfiguration is not defined
        RequiredPropertyError {
          PropertyPath = /Resources/WebsiteBucket4326D7C2/Properties[L:5,C:20]
          MissingProperty = VersioningConfiguration
          Reason = Could not find key VersioningConfiguration inside struct at path /Resources/WebsiteBucket4326D7C2/Properties[L:5,C:20]
          Code:
                3.    "WebsiteBucket4326D7C2": {
                4.      "Type": "AWS::S3::Bucket",
                5.      "Properties": {
                6.        "AccessControl": "PublicRead"
                7.      },
                8.      "Metadata": {
        }
      }
    }
  }
}

Originally posted by @alexpulver in #202 (comment)