This patch transforms Markdown soft line breaks into hard line breaks when rendering to HTML. The [CommonMark specification about soft line breaks](https://spec.commonmark.org/0.30/#soft-line-breaks) specifies: > A renderer may also provide an option to render soft line breaks as > hard line breaks. Refering to https://github.com/vector-im/element-x-ios/issues/1418, some people are expecting to get soft line breaks rendered at hard ones. This patch updates the Markdown test to include this conversion of soft to hard line breaks. It includes a list and a code block, to ensure not _all_ soft breaks are transformed into hard breaks; only the ones we expect.