Add tests for jsonrpc id

[liamsi]

#196 (comment)

part of #211

• 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 #298 into master will increase coverage by 0.2%.
The diff coverage is 100.0%.

@@           Coverage Diff            @@
##           master    #298     +/-   ##
========================================
+ Coverage    30.8%   31.0%   +0.2%     
========================================
  Files         129     129             
  Lines        4893    4905     +12     
  Branches     1549    1549             
========================================
+ Hits         1511    1525     +14     
+ Misses       2297    2294      -3     
- Partials     1085    1086      +1     

Impacted Files	Coverage Δ
tendermint/src/rpc/id.rs	60.8% <100.0%> (+60.8%)	⬆️
tendermint/src/merkle.rs	55.5% <0.0%> (ø)
tendermint/src/rpc/endpoint/abci_query.rs	0.0% <0.0%> (ø)
tendermint/src/abci/proof.rs
tendermint/src/merkle/proof.rs	45.4% <0.0%> (ø)

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[greg-szabo]

I'm fine with it as it is, although it would be nice to name the function something a bit more telling.