Invalid byte input fix

[#83253462]
Merge pull request #69 from GovWizely/yury/invalid_bytes_input

Invalid byte input fix
fixed bug on tariff rate query spec
described_class; avoid calling super in specs.
Merge pull request #68 from GovWizely/yury/tariff_rate_query_spec_fix

fixed bug on tariff rate query spec
fixed contacts field on trade events endpoint, source USTDA