Fix https reference to London region.

README.md

@@ -65,7 +65,7 @@ Click a button to launch QnABot CloudFormation stack in the desired region
 | Oregon | <a target="_blank" href="https://us-west-2.console.aws.amazon.com/cloudformation/home?region=us-west-2#/stacks/new?stackName=QnABot&templateURL=https://aws-bigdata-blog-replica-us-west-2.s3.us-west-2.amazonaws.com/artifacts/aws-ai-qna-bot/templates/public.json"><span><img height="24px" src="https://s3.amazonaws.com/cloudformation-examples/cloudformation-launch-stack.png"/></span></a> |
 | Ireland | <a target="_blank" href="https://eu-west-1.console.aws.amazon.com/cloudformation/home?region=eu-west-1#/stacks/new?stackName=QnABot&templateURL=https://aws-bigdata-blog-replica-eu-west-1.s3-eu-west-1.amazonaws.com/artifacts/aws-ai-qna-bot/templates/public.json"><span><img height="24px" src="https://s3.amazonaws.com/cloudformation-examples/cloudformation-launch-stack.png"/></span></a> |
 | Sydney | <a target="_blank" href="https://ap-southeast-2.console.aws.amazon.com/cloudformation/home?region=ap-southeast-2#/stacks/new?stackName=QnABot&templateURL=https://aws-bigdata-blog-replica-ap-southeast-2.s3-ap-southeast-2.amazonaws.com/artifacts/aws-ai-qna-bot/templates/public.json"><span><img height="24px" src="https://s3.amazonaws.com/cloudformation-examples/cloudformation-launch-stack.png"/></span></a> |
-| London | <a target="_blank" href="https://eu-west-2.console.aws.amazon.com/cloudformation/home?region=eu-west-2#/stacks/new?stackName=QnABot&templateURL=https://aws-bigdata-blog-replica-eu-west-2.s3-eu-west-1.amazonaws.com/artifacts/aws-ai-qna-bot/templates/public.json"><span><img height="24px" src="https://s3.amazonaws.com/cloudformation-examples/cloudformation-launch-stack.png"/></span></a>     | 
+| London | <a target="_blank" href="https://eu-west-2.console.aws.amazon.com/cloudformation/home?region=eu-west-2#/stacks/new?stackName=QnABot&templateURL=https://aws-bigdata-blog-replica-eu-west-2.s3-eu-west-2.amazonaws.com/artifacts/aws-ai-qna-bot/templates/public.json"><span><img height="24px" src="https://s3.amazonaws.com/cloudformation-examples/cloudformation-launch-stack.png"/></span></a>     | 
 | Frankfurt | <a target="_blank" href="https://eu-central-1.console.aws.amazon.com/cloudformation/home?region=eu-central-1#/stacks/new?stackName=QnABot&templateURL=https://aws-bigdata-blog-replica-eu-central-1.s3.eu-central-1.amazonaws.com/artifacts/aws-ai-qna-bot/templates/public.json"><span><img height="24px" src="https://s3.amazonaws.com/cloudformation-examples/cloudformation-launch-stack.png"/></span></a> |
 | Singapore | <a target="_blank" href="https://ap-southeast-1.console.aws.amazon.com/cloudformation/home?region=ap-southeast-1#/stacks/new?stackName=QnABot&templateURL=https://aws-bigdata-blog-replica-ap-southeast-1a.s3-ap-southeast-1.amazonaws.com/artifacts/aws-ai-qna-bot/templates/public.json"><span><img height="24px" src="https://s3.amazonaws.com/cloudformation-examples/cloudformation-launch-stack.png"/></span></a> |
 | Tokyo | <a target="_blank" href="https://ap-northeast-1.console.aws.amazon.com/cloudformation/home?region=ap-northeast-1#/stacks/new?stackName=QnABot&templateURL=https://aws-bigdata-blog-replica-ap-northeast-1.s3-ap-northeast-1.amazonaws.com/artifacts/aws-ai-qna-bot/templates/public.json"><span><img height="24px" src="https://s3.amazonaws.com/cloudformation-examples/cloudformation-launch-stack.png"/></span></a> |