Magento upgrade 2.1.9 -> 2.2.0

gistfile1.txt

 $ composer require magento/product-community-edition 2.2.0 --no-update

 $ rm -rf vendor/*
zsh: sure you want to delete all the files in /home/moshe/html/a9/vendor [yn]? y

 $ composer update
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - magento/module-wishlist-sample-data 100.1.0-rc1 requires magento/module-wishlist 100.1.* -> satisfiable by magento/module-wishlist[100.1.0-rc1, 100.1.0-rc2, 100.1.0-rc3, 100.1.0, 100.1.1, 100.1.2, 100.1.3, 100.1.4, 100.1.5, 100.1.6].
    - magento/module-wishlist-sample-data 100.1.0-rc2 requires magento/module-wishlist 100.1.* -> satisfiable by magento/module-wishlist[100.1.0-rc1, 100.1.0-rc2, 100.1.0-rc3, 100.1.0, 100.1.1, 100.1.2, 100.1.3, 100.1.4, 100.1.5, 100.1.6].
    - magento/module-wishlist-sample-data 100.1.0-rc3 requires magento/module-wishlist 100.1.* -> satisfiable by magento/module-wishlist[100.1.0-rc1, 100.1.0-rc2, 100.1.0-rc3, 100.1.0, 100.1.1, 100.1.2, 100.1.3, 100.1.4, 100.1.5, 100.1.6].
    - magento/module-wishlist-sample-data 100.1.0 requires magento/module-wishlist 100.1.* -> satisfiable by magento/module-wishlist[100.1.0-rc1, 100.1.0-rc2, 100.1.0-rc3, 100.1.0, 100.1.1, 100.1.2, 100.1.3, 100.1.4, 100.1.5, 100.1.6].
    - magento/module-wishlist-sample-data 100.1.1 requires magento/module-wishlist 100.1.* -> satisfiable by magento/module-wishlist[100.1.0-rc1, 100.1.0-rc2, 100.1.0-rc3, 100.1.0, 100.1.1, 100.1.2, 100.1.3, 100.1.4, 100.1.5, 100.1.6].
    - Can only install one of: magento/module-wishlist[101.0.0, 100.1.0-rc1].
    - Can only install one of: magento/module-wishlist[101.0.0, 100.1.0-rc2].
    - Can only install one of: magento/module-wishlist[101.0.0, 100.1.0-rc3].
    - Can only install one of: magento/module-wishlist[101.0.0, 100.1.0].
    - Can only install one of: magento/module-wishlist[101.0.0, 100.1.1].
    - Can only install one of: magento/module-wishlist[101.0.0, 100.1.2].
    - Can only install one of: magento/module-wishlist[101.0.0, 100.1.3].
    - Can only install one of: magento/module-wishlist[101.0.0, 100.1.4].
    - Can only install one of: magento/module-wishlist[101.0.0, 100.1.5].
    - Can only install one of: magento/module-wishlist[101.0.0, 100.1.6].
    - magento/product-community-edition 2.2.0 requires magento/module-wishlist 101.0.0 -> satisfiable by magento/module-wishlist[101.0.0].
    - Installation request for magento/product-community-edition 2.2.0 -> satisfiable by magento/product-community-edition[2.2.0].
    - Installation request for magento/module-wishlist-sample-data 100.1.* -> satisfiable by magento/module-wishlist-sample-data[100.1.0-rc1, 100.1.0-rc2, 100.1.0-rc3, 100.1.0, 100.1.1].