Derive Hash on tendermint::Time

[mzabaluev]

Now that we're backed by a data structure with unambiguously unique values, we can make time moments hashable.

• 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 #1054 (597296d) into master (01ff277) will decrease coverage by 0.1%.
The diff coverage is 100.0%.

@@           Coverage Diff            @@
##           master   #1054     +/-   ##
========================================
- Coverage    62.5%   62.4%   -0.2%     
========================================
  Files         236     236             
  Lines       21321   21342     +21     
========================================
- Hits        13331   13319     -12     
- Misses       7990    8023     +33     

Impacted Files	Coverage Δ
tendermint/src/time.rs	98.5% <100.0%> (ø)
tendermint/src/evidence.rs	21.6% <0.0%> (-3.8%)	⬇️
config/src/config.rs	55.0% <0.0%> (-1.5%)	⬇️
testgen/src/validator.rs	86.7% <0.0%> (-0.8%)	⬇️
abci/src/server.rs	9.2% <0.0%> (-0.4%)	⬇️
tendermint/src/node.rs	63.7% <0.0%> (+0.1%)	⬆️
testgen/src/header.rs	80.2% <0.0%> (+0.6%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 01ff277...597296d. Read the comment docs.

[greg-szabo]

Cool!

[thanethomson]

Nice! Ready to merge this, or is there more you want to do here?

[mzabaluev]

Oh, let me dress it up with a changelog entry :)