Makes the ChannelBuilder build a public method

[juanpedromoreno]

This PR removes the unnecessary private modifier for the Channel build method.

@vejeta ^^

[vejeta]

LGTM

[codecov-io]

Codecov Report

Merging #45 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #45   +/-   ##
=======================================
  Coverage   12.01%   12.01%           
=======================================
  Files          20       20           
  Lines         283      283           
  Branches        2        2           
=======================================
  Hits           34       34           
  Misses        249      249

Impacted Files	Coverage Δ
rpc/src/main/scala/client/package.scala	0% <ø> (ø)	⬆️

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