[input-output-hk/cardano-sl] Cardano build signature issue (#3335)

running:
`nix-build -A cardano-sl-node-static —cores 0 —max-jobs 2 —no-build-output —out-link master`

gives me
«`
warning: substituter ‘https://hydra.iohk.io’ does not have a valid signature for path ‘/nix/store/4iv6n7fvzxydbgmsa8l
dxnfxlnk8f69g-nixpkgs’
error: build of ‘/nix/store/l0wvfm6mwr6qcjca5sw433whv0qiqr5l-nixpkgs.drv’ failed
(use ‘—show-trace’ to show detailed location information)
lucis@ledger8-test:~/chaindata/cardano_2018-08-01/cardano-sl$
«`

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