Update nix version in travis.yml to 2.3.4

Follow up to bumping this version in the NUR repository.

The default nix version is quite old and has a problematic or missing `fromTOML` implementation.
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Peter Kolloch 2020-05-02 16:34:22 +02:00 committed by GitHub
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commit 0904d943ed
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@ -1,4 +1,5 @@
language: nix
nix: 2.3.4
sudo: false