0.33 compat followup

[liamsi]

Addressing @melekes review comments as part of #211.

Note that there is one comment still unaddressed but it is tracked separately already and the code might change due the ongoing light client refactoring.

• Referenced an issue explaining the need for the change
• Updated all relevant documentation in docs
• Updated all code comments where relevant
• Wrote tests
• Updated CHANGES.md

[codecov-commenter]

Codecov Report

Merging #296 into master will not change coverage.
The diff coverage is 0.0%.

@@          Coverage Diff           @@
##           master    #296   +/-   ##
======================================
  Coverage    30.8%   30.8%           
======================================
  Files         129     129           
  Lines        4893    4893           
  Branches     1549    1549           
======================================
  Hits         1511    1511           
  Misses       2297    2297           
  Partials     1085    1085           

Impacted Files	Coverage Δ
tendermint/src/block/commit_sig.rs	48.3% <0.0%> (ø)
tendermint/src/lite_impl/signed_header.rs	62.9% <0.0%> (ø)
tendermint/src/serializers/raw_commit_sig.rs	21.0% <ø> (ø)

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[melekes]

👍