Fixed #252

[wkexiang]

Issue #, if available:
#252

Description of changes:
Added one space between Message and =. Also did the same for when Error should be emitted.

$ cargo run --package cfn-guard --bin 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.      },
                7.      "Metadata": {
                8.        "aws:cdk:path": "LandingPageFrontend/Website/Bucket/Resource"
        }
      }
    }
  }
}

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[akshayrane]

LGTM

[razcloud]

gtg