Mention squash merges are optional and clarify the wording.

Closes: cncf#883

README.md

@@ -161,7 +161,7 @@ If you want to create an interactive landscape for your project or organization:
 1. Note ahead of time that the hardest part of building a landscape is getting hi-res images for every project. You *cannot* convert from a PNG or JPEG into an SVG. You need to get an SVG, AI, or EPS file. When those aren't available, you will  need a graphic designer to recreate several images. Don't just use an auto-tracer to try to convert PNG to SVG because there is some artistry involved in making it look good. Please review this [primer](https://www.cncf.io/blog/2019/07/17/what-image-formats-should-you-be-using-in-2019/) on image formats. 
 2. Create a repo `youracronym-landscape` so it's distinct from other landscapes stored in the same directory. From inside your new directory, copy over files from a simpler landscape like https://github.com/graphql/graphql-landscape with `cp -r ../graphql-landscape/* ../graphql-landscape/.github ../graphql-landscape/.gitignore ../graphql-landscape/.npmrc ../graphql-landscape/.nvmrc .`.
 3. If you're working with the [LF](https://www.linuxfoundation.org/), give admin privileges to the new repo to [dankohn](https://github.com/dankohn) and write privileges to [AndreyKozlov1984](https://github.com/AndreyKozlov1984), [jordinl83](https://github.com/jordinl83), and [CNCF-Bot](https://github.com/CNCF-Bot) and ping Dan after creating an account at [slack.cncf.io](https://slack.cncf.io). Alex Contini and Dan are available there to help you recreate SVGs based on a PNG of the company's logo, if necessary, and to fix other problems.
-4. Set the repo to only support merge commits and turn off DCO support, since it doesn't work well with the GitHub web interface:
+4. (Optional): Set the repo to only support squashed commit merges, and turn off DCO support since it doesn't work well with the GitHub web interface:
 ![image](https://user-images.githubusercontent.com/3083270/66166276-dd62ad00-e604-11e9-87db-fd9ae7a80d1a.png)
 5. Edit `settings.yml` and `landscape.yml` for your topic.
 6. [Generate](https://www.qrcode-monkey.com) a QR code, setting colors to black. Save as SVG and overwrite images/qr.svg.