fix 153; _restclient pins aiohttp version to <=3.7.4.post0

[aaraney]

See #153. In short, aiohttp> 3.7.4.post0 causes aiohttp_client_cache to throw SyntaxError.

Changes

• aiohttp pinned version to <=3.7.4.post0

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[aaraney]

redeployed _restclient