Improved documentation.

Makefile

@@ -1,6 +1,6 @@
 all: build
 
-VERSION=0.4.0
+VERSION=0.5.0
 
 build:
 	GO111MODULE=on go build awsom-cloudformation-certificate.go

awsom-cloudformation-certificate.go

@@ -48,9 +48,10 @@ func certificateResource(ctx context.Context, event cfn.Event) (physicalResource
 		}
 		for _, cert := range certificates.CertificateSummaryList {
 			if *cert.CertificateArn == event.PhysicalResourceID {
-				if *cert.DomainName != domain {
-					fmt.Printf("Domain %s has been changed to %s. Updating resource.\n", *cert.DomainName, domain)
-					err = deleteValidatedCertificate(domain, hostedZone)
+				existingDomainName := *cert.DomainName
+				if existingDomainName != domain {
+					fmt.Printf("Domain %s has been changed to %s. Updating resource.\n", existingDomainName, domain)
+					err = deleteValidatedCertificate(existingDomainName, hostedZone)
 					if err != nil {
 						e = err
 						return

readme.md

@@ -1,6 +1,6 @@
 # Validated ACM certificate resource for AWS CloudFormation 
 
-[![Version](https://img.shields.io/badge/Awsom%20Resource%20Certificate-0.4.0-blue.svg)](https://github.com/hekonsek/awsom-resource-certificate/releases)
+[![Version](https://img.shields.io/badge/Awsom%20Resource%20Certificate-0.5.0-blue.svg)](https://github.com/hekonsek/awsom-resource-certificate/releases)
 
 This is custom CloudFormation resource for validated [ACM](https://aws.amazon.com/certificate-manager) HTTPS/CA certificate. It
 creates ACM request together with DNS CNAME recordset in Route53 for validation purposes. The resource creation process
@@ -19,10 +19,14 @@ Certificate:
 
 ## Usage
 
-The latest release of this resource can be found [here](s3://capsilon-awsom/awsom-cloudformation-certificate-0.4.0.zip).
+The latest release of this resource can be found [here](s3://capsilon-awsom/awsom-cloudformation-certificate-0.5.0.zip).
 I can't promise this hosting site will be available in the future, so I highly recommend to download the zip file and
 host it in your own S3 bucket.
 
+Here is the list of properties available for this resource:
+- `Domain` - Mandatory. ACM domain. For example `*.subdomain.example.com` .
+- `HostedZone` - Mandatory. Name of the hosted zone that will be used to perform DNS challenge. For example `example.com` .
+
 In order to use this resource you have to define its definition as a Lambda in the first place. This is standard 
 practice for custom CloudFormation resources.
 
@@ -61,9 +65,9 @@ Resources:
       Handler: awsom-cloudformation-certificate 
       Code: 
         S3Bucket: capsilon-awsom
-        S3Key: awsom-cloudformation-certificate-0.4.0.zip
+        S3Key: awsom-cloudformation-certificate-0.5.0.zip
       Role: !Sub ${CloudFormationCertificateResourceRole.Arn}
-      Timeout: 1200
+      Timeout: 900
 
   Certificate:
     Type: Custom::Certificate