update readme

[yutongp]

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[CLAassistant]

All committers have signed the CLA.

[codecov-io]

Codecov Report

Merging #50 into master will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #50      +/-   ##
==========================================
+ Coverage   69.72%   69.79%   +0.06%     
==========================================
  Files          79       79              
  Lines        8057     8057              
==========================================
+ Hits         5618     5623       +5     
+ Misses       1725     1720       -5     
  Partials      714      714

Impacted Files	Coverage Δ
pkg/routine/recurringtask.go	92.59% <0%> (-7.41%)	⬇️
network/pinger.go	50% <0%> (ø)	⬆️
explorer/explorer.go	69.73% <0%> (+0.26%)	⬆️
network/peermanager.go	46.73% <0%> (+5.43%)	⬆️

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