.travis.yml: Use nix 2.3.4

The default versions is quite old and has e.g. broken fromTOML support.
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Peter Kolloch 2020-05-02 16:30:33 +02:00 committed by GitHub
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@ -1,4 +1,5 @@
language: nix
nix: 2.3.4
notifications:
irc: