rpc: remove usage of deprecated method in client

[liamsi]

One-liner that fixes the build again.

I've verified that this change doesn't modify the current logic/init. See https://github.com/hyperium/hyper/pull/2142/files for yourself in case you have doubts.

ref https://circleci.com/gh/interchainio/tendermint-rs/1202
closes #165

• 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-io]

Codecov Report

Merging #166 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master     #166   +/-   ##
=======================================
  Coverage   39.68%   39.68%           
=======================================
  Files          91       91           
  Lines        3276     3276           
  Branches      490      490           
=======================================
  Hits         1300     1300           
  Misses       1690     1690           
  Partials      286      286

Impacted Files	Coverage Δ
tendermint/src/rpc/client.rs	0% <0%> (ø)	⬆️

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[brapse]

LGTM 👍

[liamsi]

Thanks, can you approve @brapse? Otherwise I can't merge.