fix document

[dcb9]

there is no filters property on ETH object

ethjs/src/index.js

Line 34 in 356ed3c

self.filter = new EthFilter(query, self.options.query);

ethjs

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[coveralls]

Coverage remained the same at 100.0% when pulling c3cacb3 on dcb9:patch-1 into 356ed3c on ethjs:master.