Release v0.17.0-rc2

[thanethomson]

I've started updating the CHANGELOG for the v0.17.0-rc2 release.

📖 Rendered CHANGELOG.md

• 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

[greg-szabo]

html_root_url changes?

[codecov-io]

Codecov Report

Merging #668 (61a245d) into master (7ab136c) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #668   +/-   ##
======================================
  Coverage    39.5%   39.5%           
======================================
  Files         183     183           
  Lines       12871   12871           
  Branches     2943    2943           
======================================
  Hits         5095    5095           
  Misses       7528    7528           
  Partials      248     248           

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	100.0% <ø> (ø)
rpc/src/lib.rs	100.0% <ø> (ø)
tendermint/src/lib.rs	100.0% <ø> (ø)

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