Mention opentelemetry-stackdriver as part of the ecosystem

[djc]

No description provided.

[codecov]

Codecov Report

Merging #360 (edf568c) into master (68f041a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #360   +/-   ##
=======================================
  Coverage   54.56%   54.56%           
=======================================
  Files          70       70           
  Lines        5914     5914           
=======================================
  Hits         3227     3227           
  Misses       2687     2687           

Impacted Files	Coverage Δ
opentelemetry/src/lib.rs	100.00% <ø> (ø)

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[TommyCpp]

I think we thought about it back then but decided not to add it as it didn't seem to be in active development. But if that's not the case, 👍 for adding it.

[djc]

I've brought it up to date. If it goes silent again I'll fork it.

[jtescher]

Can we add this to the README as well? (currently both this crate and repo root readmes, could consider making one a symlink)

[djc]

Done.