message: Fix broken link to "lots" "more..." in readme
diff: @@ -152,7 +152,7 @@ GitHub Enterprise is also supported by [authorizing your own domain in the optio
  - Shows the reactions popover on hover instead of click
  - Changes the default sort order of milestones to "Closest due date"
  -And [lots](src/content.css) [more...](src/content.js)
  +And [lots](source/content.css) [more...](source/content.js)
  ### More shortcuts
  