Istanbul upgrade

[ucwong]

No description provided.

[codecov]

Codecov Report

Merging #876 (8f81642) into master (7275f08) will decrease coverage by 0.07%.
The diff coverage is 2.17%.

@@            Coverage Diff             @@
##           master     #876      +/-   ##
==========================================
- Coverage   49.29%   49.22%   -0.08%     
==========================================
  Files         420      420              
  Lines       48067    48100      +33     
==========================================
- Hits        23694    23675      -19     
- Misses      22304    22354      +50     
- Partials     2069     2071       +2     

Impacted Files	Coverage Δ
consensus/cuckoo/consensus.go	1.60% <0.00%> (ø)
core/state/snapshot/generate.go	0.00% <0.00%> (ø)
core/state/snapshot/journal.go	0.00% <0.00%> (ø)
core/state_transition.go	39.49% <0.00%> (+0.24%)	⬆️
ctxc/peer.go	68.63% <0.00%> (ø)
params/config.go	33.33% <100.00%> (+0.70%)	⬆️
p2p/discover/v4_udp.go	72.91% <0.00%> (-4.33%)	⬇️
p2p/discover/table.go	82.48% <0.00%> (-1.83%)	⬇️
p2p/discv5/table.go	57.98% <0.00%> (-1.69%)	⬇️
ctxc/downloader/statesync.go	55.03% <0.00%> (-1.17%)	⬇️
... and 11 more