I've added an alias to git.io the github url shortening service from git.io/get_helm.sh -> https://raw.githubusercontent.com/helm/helm/master/scripts/get

Like this:
```
$ curl -i https://git.io/ -F url=https://raw.githubusercontent.com/helm/helm/master/scripts/get -F code=get_helm.sh

HTTP/1.1 201 Created
Server: Cowboy
Connection: keep-alive
Date: Fri, 19 Apr 2019 23:20:39 GMT
Status: 201 Created
Content-Type: text/html;charset=utf-8
Location: https://git.io/get_helm.sh
Content-Length: 62
X-Xss-Protection: 1; mode=block
X-Content-Type-Options: nosniff
X-Frame-Options: SAMEORIGIN
X-Runtime: 0.008310
X-Node: f065811c-e0e8-4384-bf09-9d9d28586c4d
X-Revision: 392798d237fc1aa5cd55cada10d2945773e741a8
Strict-Transport-Security: max-age=31536000; includeSubDomains
Via: 1.1 vegur
```
I think it's a little easier to remember and use.
There is also no way to overwrite or modify alias. Once it's there it's there in perpetuity.

Thanks!
Signed-off-by: Duffie Cooley <dcooley@heptio.com>