[xmlunit/xmlunit.net] ac7312: typo - snake case rather than dash separated

[GitHub <no...@gi...>]

  Branch: refs/heads/master
  Home:   https://github.com/xmlunit/xmlunit.net
  Commit: ac7312f9ae7193924d9c84f313198514f97fe42d
      https://github.com/xmlunit/xmlunit.net/commit/ac7312f9ae7193924d9c84f313198514f97fe42d
  Author: Stefan Bodewig <ste...@fr...>
  Date:   2015-06-06 (Sat, 06 Jun 2015)

  Changed paths:
    M appveyor.yml

  Log Message:
  -----------
  typo - snake case rather than dash separated