feat(api.md): add / fix some return values (#40)
feat(api.md): add / fix some return values (#40)

Currently, return value of `carlo.launch()` is not shown properly:
Markdown parser seems to be confused with unescaped `<` characters
and swallows `App` part of the return value type.
Linkification of this part seems to fix parsing and rendering.
GoogleChromeLabs/carlo,GoogleChromeLabs/carlo