Elixir CI

Update to Electric 1.2.x and electric_client 0.8.0 #244

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10 errors

test create car renders errors when data is invalid (PhoenixSyncExampleWeb.CarControllerTest)

test update car renders errors when data is invalid (PhoenixSyncExampleWeb.CarControllerTest)

test create car renders car when data is valid (PhoenixSyncExampleWeb.CarControllerTest)

test index lists all cars (PhoenixSyncExampleWeb.CarControllerTest)

test delete car deletes chosen car (PhoenixSyncExampleWeb.CarControllerTest)

test GET / (PhoenixSyncExampleWeb.PageControllerTest)

test renders 500 (PhoenixSyncExampleWeb.ErrorJSONTest)

test renders 404 (PhoenixSyncExampleWeb.ErrorJSONTest)

test renders 500.html (PhoenixSyncExampleWeb.ErrorHTMLTest)

test renders 404.html (PhoenixSyncExampleWeb.ErrorHTMLTest)