Fix evaluation failure in CI (#121)

Hydra complains about the branch name with:

```
hydra-eval-jobs returned exit code 1:
error: worker error: invalid Git branch/tag name 'refs/heads/nixos-unstable'
```

... and the branch name is not necessary anyway
This commit is contained in:
Gabriel Gonzalez 2020-05-26 09:08:02 -07:00 committed by GitHub
parent b4908eb261
commit 98a4e61e1c
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@ -3,7 +3,6 @@ let
nixpkgs = builtins.fetchGit {
inherit (spec) url rev;
ref = "refs/heads/nixos-unstable";
};
overlay = pkgsNew: pkgsOld: {