Reference to tool GitReleaseManager.Tool in toolsettings.cake needs to be updated

[cake-contrib-bot]

Reference to GitReleaseManager.Tool 0.13.0 in toolsettings.cake should be updated to 0.14.0

[Nils Andresen]

Actually, I am running more and more into the

System.OverflowException: Value was either too large or too small for an Int32.

Exception when running GRM.

I feel we should update to GRM 0.17.0, which fixed GitTools/GitReleaseManager#578

[Nils Andresen]

There was another, rather similar issue in Octokit. That issue was resolved in Octokit 12.0.0, which in turn got incorporated in GRM 0.18.0.
Hence, we should update to 0.18.0, not 0.17.0.