...and now lets try this from GitTools/GitVersion#912

Author: binarymash

.travis.yml

@@ -2,9 +2,7 @@ language: csharp
 os:
   - linux
 before-install:
-  - git clone https://github.com/$TRAVIS_REPO_SLUG.git $TRAVIS_REPO_SLUG
-  - cd $TRAVIS_REPO_SLUG
-  - git checkout -qf $TRAVIS_COMMIT 
+  - git fetch origin +refs/heads/*:refs/remotes/origin/* --unshallow
 mono:
   - latest
 dotnet: 1.0.4