Update implementation to use non-deprecated api calls#36

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iwittkau wants to merge 10 commits intomwitkow:masterfrom iwittkau:master

+230-137

Commits on Nov 20, 2017

Break StreamDirector interface, fix metadata propagation for gRPC-Go>1.5. (mwitkow#20 )
Michal Witkowski
authored

Commits on Sep 12, 2018

Update gRPC and fix tests (mwitkow#27 )

JackWink
authored and
bwplotka
committed

Commits on Oct 18, 2018

Commits on Oct 22, 2018