Particular/GitVersion — pull request #188 by graemefoster (2014-06-06 14:12:08+00:00)
Title: Upgrade libgit2sharp

LibGit2Sharp cannot build pull-requests on private repos on V17 as it was unable to pass credentials in the CreateFakeBranchPointingAtThePullRequestTip method.

This is fixed in v18 which provides an option to pass credentials to Network.ListReferences
This PR upgrades LibGit2Sharp to enable this method to be used.