change intial download size

[ucwong]

No description provided.

[codecov]

Codecov Report

Merging #755 into master will increase coverage by 0.07%.
The diff coverage is 81.81%.

@@            Coverage Diff             @@
##           master     #755      +/-   ##
==========================================
+ Coverage   50.30%   50.38%   +0.07%     
==========================================
  Files         409      409              
  Lines       52841    52842       +1     
==========================================
+ Hits        26583    26622      +39     
+ Misses      24255    24208      -47     
- Partials     2003     2012       +9     

Impacted Files	Coverage Δ
ctxc/downloader/downloader.go	78.67% <71.42%> (-0.65%)	⬇️
ctxc/downloader/queue.go	81.30% <100.00%> (+0.04%)	⬆️
trie/proof.go	75.74% <0.00%> (-2.62%)	⬇️
p2p/discover/table.go	84.19% <0.00%> (-2.44%)	⬇️
p2p/peer.go	78.99% <0.00%> (ø)
p2p/discover/v5_udp.go	73.31% <0.00%> (+0.46%)	⬆️
p2p/simulations/http.go	70.10% <0.00%> (+0.54%)	⬆️
whisper/whisperv6/whisper.go	55.22% <0.00%> (+1.21%)	⬆️
p2p/simulations/mocker.go	35.45% <0.00%> (+1.81%)	⬆️
... and 4 more