w_scan: 20161022 -> 20170107

Semi-automatic update generated by https://github.com/ryantm/nix-update tools. These checks were done:

- built on NixOS
- ran `/nix/store/w28jzw0lnbqy9sdpm78lf4n282x05f74-w_scan-20170107/bin/w_scan -h` got 0 exit code
- ran `/nix/store/w28jzw0lnbqy9sdpm78lf4n282x05f74-w_scan-20170107/bin/w_scan --help` got 0 exit code
- ran `/nix/store/w28jzw0lnbqy9sdpm78lf4n282x05f74-w_scan-20170107/bin/w_scan -V` and found version 20170107
- ran `/nix/store/w28jzw0lnbqy9sdpm78lf4n282x05f74-w_scan-20170107/bin/w_scan -h` and found version 20170107
- ran `/nix/store/w28jzw0lnbqy9sdpm78lf4n282x05f74-w_scan-20170107/bin/w_scan --help` and found version 20170107
- found 20170107 in filename of file in /nix/store/w28jzw0lnbqy9sdpm78lf4n282x05f74-w_scan-20170107