changelog: Reference multiple issues/pull requests for a single entry

[tjanez]

Update the Change Log template to list multiple issues on separate lines.

[codecov]

Codecov Report

Merging #2697 into master will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2697      +/-   ##
==========================================
- Coverage   63.09%   63.05%   -0.05%     
==========================================
  Files         377      376       -1     
  Lines       35448    35324     -124     
==========================================
- Hits        22367    22273      -94     
+ Misses      10273    10243      -30     
  Partials     2808     2808

Impacted Files	Coverage Δ
go/consensus/tendermint/api/api.go	73.58% <0%> (-15.1%)	⬇️
go/storage/mkvs/urkel/remove.go	82.22% <0%> (-3.2%)	⬇️
go/worker/common/p2p/p2p.go	64.86% <0%> (-2.71%)	⬇️
go/storage/mkvs/urkel/lookup.go	72.72% <0%> (-2.28%)	⬇️
go/runtime/tagindexer/tagindexer.go	70.65% <0%> (-2.18%)	⬇️
...o/consensus/tendermint/apps/scheduler/scheduler.go	71.7% <0%> (-1.38%)	⬇️
go/common/grpc/grpc.go	77.59% <0%> (-1.25%)	⬇️
go/runtime/transaction/transaction.go	75.9% <0%> (-1.21%)	⬇️
go/storage/mkvs/urkel/urkel.go	84.61% <0%> (-1.1%)	⬇️
...ensus/tendermint/apps/staking/proposing_rewards.go	76.92% <0%> (-0.86%)	⬇️
... and 17 more

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