get.docker.com certificate expired - maybe this should go here?

[TomasHubelbauer]

docker/for-linux#328

[seemethere]

Everything should be fixed now!

❯ curl -IL https://get.docker.com
HTTP/1.1 200 OK
Content-Type: text/plain
Content-Length: 13847
Connection: keep-alive
Date: Tue, 01 May 2018 09:04:13 GMT
Last-Modified: Wed, 25 Apr 2018 18:23:19 GMT
x-amz-version-id: ml2j3ltSM9mIqVYIUvRNPGiOd6iyo4kH
ETag: "41587a5e3b3cdfdec2580853361f8b63"
Server: AmazonS3
Age: 34398
X-Cache: Hit from cloudfront
Via: 1.1 ff09df097f823b2834408d17e9779d62.cloudfront.net (CloudFront)
X-Amz-Cf-Id: kagB7fPfnDDU6GtqWe2ldjxpIvWu2uy2LK_4Sgepy-4Csf8ChO0cKw==