Avoid use of deprecated API in README code example
The `securityGroups` property on `aws.ec2.Instance` has been deprecated for some time, and does not support updates.  Use `vpcSecurityGroupIds` instead.
@@ -38,7 +38,7 @@ for (let i = 0; i < 3; i++) {
new aws.ec2.Instance(`web-${i}`, {
ami: "ami-7172b611",
instanceType: "t2.micro",
- securityGroups: [ sg.name ],
+ vpcSecurityGroupIds: [sg.id],
userData: `#!/bin/bash
echo "Hello, World!" > index.html
nohup python -m SimpleHTTPServer 80 &`,
