Added changes to simid 1.1

[ryanthompson591]

Adds a list of changes introduced by SIMID 1.1 to the executive summary.

---

:boom: Error: 400 Bad Request :boom:

PR Preview failed to build. (Last tried on Aug 4, 2020, 7:59 PM UTC).

More

PR Preview relies on a number of web services to run. There seems to be an issue with the following one: :rotating_light: [CSS Spec Preprocessor](https://api.csswg.org/bikeshed/) - CSS Spec Preprocessor is the web service used to build Bikeshed specs. :link: [Related URL](https://api.csswg.org/bikeshed/?url=https%3A%2F%2Fraw.githubusercontent.com%2FInteractiveAdvertisingBureau%2FSIMID%2Fb656994db48729bffa3903f4bfa29cbaa67e6a11%2Findex.bs&md-warning=not%20ready) ``` Error running preprocessor, returned code: 2. FATAL ERROR: Line 513 isn't indented enough (needs 1 indent) to be valid Markdown: " * New messages [[#simid-creative-expandNonlinear]], [[#simid-creative-collapseNonlinear]], and [[#simid-player-collapseNonlinear]]." ✘ Did not generate, due to fatal errors ``` _If you don't have enough information above to solve the error by yourself (or to understand to which web service the error is related to, if any), please [file an issue](https://github.com/tobie/pr-preview/issues/new?title=Error%20not%20surfaced%20properly&body=See%20InteractiveAdvertisingBureau/SIMID%23359.)._

[ryanthompson591]

Git is causing me too much grief with this PR so I'm going to drop it and check in another.