Release v0.17.0-rc3

[thanethomson]

See the CHANGELOG for details.

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

[codecov-io]

Codecov Report

Merging #684 (dfed548) into master (ad3b00d) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #684   +/-   ##
======================================
  Coverage    39.4%   39.4%           
======================================
  Files         191     191           
  Lines       12595   12595           
  Branches     3234    3234           
======================================
  Hits         4974    4974           
  Misses       7284    7284           
  Partials      337     337           

Impacted Files	Coverage Δ
light-client/src/lib.rs	100.0% <ø> (ø)
light-node/src/lib.rs	100.0% <ø> (ø)
proto/src/lib.rs	78.9% <ø> (ø)
tendermint/src/lib.rs	100.0% <ø> (ø)

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