Release v0.20.0

[thanethomson]

📖 CHANGELOG rendered

• Referenced an issue explaining the need for the change
• Updated all relevant documentation in docs
• Updated all code comments where relevant
• Wrote tests
• Added entry in .changelog/

[codecov-commenter]

Codecov Report

Merging #912 (0aa70fd) into master (bb828d2) will increase coverage by 0.0%.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #912   +/-   ##
======================================
  Coverage    70.7%   70.7%           
======================================
  Files         203     203           
  Lines       16217   16217           
======================================
+ Hits        11467   11473    +6     
+ Misses       4750    4744    -6     

Impacted Files	Coverage Δ
light-client/src/lib.rs	100.0% <ø> (ø)
proto/src/lib.rs	100.0% <ø> (ø)
tendermint/src/lib.rs	100.0% <ø> (ø)
light-client/src/types.rs	29.8% <0.0%> (-1.2%)	⬇️
testgen/src/vote.rs	83.7% <0.0%> (-0.9%)	⬇️
testgen/src/header.rs	78.1% <0.0%> (-0.7%)	⬇️
tendermint/src/block/commit_sig.rs	79.5% <0.0%> (+2.2%)	⬆️
tendermint/src/abci/transaction.rs	67.1% <0.0%> (+14.9%)	⬆️

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[xla]

Nice, just some smaller corrections, suggestions for the summary.

[xla]

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