add cover test to workflow
add cover test to workflow

Signed-off-by: Gregory Hill <17cc3f54f5f0bae7f97622b58efbe607742c8d6a@monax.io>

silasdavis/burrow,silasdavis/burrow,eris-ltd/eris-db,silasdavis/burrow,eris-ltd/eris-db