Fix WebSocket Provider Block Subscription #849
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This PR removes the second argument, an empty object, from the block header subscription call in the WebSocket provider.
Both Geth and Parity throw due to the presence of a second argument. There was a time when Geth expected an empty object to be passed, but this has since been removed to keep compatibility with Parity.
Geth Error:
Error: too many arguments, want at most 1
Parity Error:
Couldn't parse parameters: newHeads