Add websocket exporter

[asiffer]

No description provided.

[codecov]

Codecov Report

Merging #33 (2db588a) into master (43254c9) will increase coverage by 1.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #33      +/-   ##
==========================================
+ Coverage   80.55%   81.57%   +1.01%     
==========================================
  Files          46       47       +1     
  Lines        1574     1661      +87     
==========================================
+ Hits         1268     1355      +87     
+ Misses        220      215       -5     
- Partials       86       91       +5     

Impacted Files	Coverage Δ
exporter/socket.go	79.68% <ø> (-2.58%)	⬇️
exporter/spot_alert.go	100.00% <ø> (+35.71%)	⬆️
exporter/websocket.go	85.10% <ø> (ø)
miner/config.go	83.82% <ø> (ø)
miner/dispatcher.go	92.55% <ø> (ø)
miner/miner.go	77.77% <ø> (+0.57%)	⬆️
miner/offline.go	76.66% <ø> (ø)
miner/online.go	73.07% <ø> (ø)
... and 4 more

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