If you love catipsum.com & sketch as much as I do, then I don't know how could you live without this plugin.
Anyway, this is the internet, everything is better when there are cats involved.
Download the ZIP and copy the contents on the Plugins folder. If you don't know where this folder is, you can open it by clicking on Plugins > Reveal Plugins Folder.
Select any text element in Sketch and press ( ⇧ ⌥ ⌘ K ) to get a catwesome text.
Based on catipsum.com, go there!