FIX local command flag added to example

[philcryer]

As discussed in Slack, just a simple fix in the getting started page. The user is running locally, so you need the --local flag in the example command, just like all the others are on the page, to allow it to run without error.

- Now try running `converge plan helloYou.hcl`. The same thing happens as if you had called the module yourself!
+ Now try running `converge plan --local helloYou.hcl`. The same thing happens as if you had called the module yourself!

[BrianHicks]

Thanks @philcryer!