This corrects the call to eth_getBlockByNumber, which previously
returned this error:
can't get latest block: missing value for required argument 1
Co-authored-by: Felix Lange <fjl@twurst.com>
There is no need to depend on the old context package now that the
minimum Go version is 1.7. The move to "context" eliminates our weird
vendoring setup. Some vendored code still uses golang.org/x/net/context
and it is now vendored in the normal way.
This change triggered new vet checks around context.WithTimeout which
didn't fire with golang.org/x/net/context.
