Log Message:
calibre: update to 3.34.0.

- version: 3.34.0
  date: 2018-11-08

  new features:
    - title: "Support for the new Kindle Paperwhite 2018"

    - title: "Metadata plugboards: Allow defining plugboards that modify \ 
comments metadata as well"

    - title: "E-book viewer: Add a keyboard shortcut (Ctrl+M) for toggling \ 
between paged and flow mode"

  bug fixes:
    - title: "EPUB Input: Handle invalid EPUB files that have their NCX \ 
documents in the spine."

    - title: "EPUB3 Input: Handle EPUB 3 files that incorrectly use EPUB 2 \ 
markup to identify cover images."

    - title: "Content server: Fix --url-prefix feature not working with \ 
book conversion"

  improved recipes:
    - Business Standard
    - Washington Post
    - General Knowledge Today
    - How To Geek

  new recipes:
    - title: Arts and Letters Daily
      author: pjpaulpj

    - title: Magyar Idok
      author: pofa

And many more new recipes and bug fixes.