Properly format OT error logs. (lightstep#72)

Merge pull request lightstep#64 from lightstep/cody/access-token-headers

Lightstep-Access-Token Header Addition

Merge pull request lightstep#63 from lightstep/austin/thriftResiliency

Ignore error statuses in Thrift client response path

Updating Version to 4.0.2

Merge pull request lightstep#57 from michael-booth/update-timestamp-u…

…sage

Calculate and set seconds and nanos for Span's Timestamp proto

Releaseing Version to 4.0.0

Merge pull request lightstep#34 from nvillalva/nvillalva/fmt-exception

Format error on exception handling

Updating Version to 3.0.7

Updating Version to 3.0.7

Updating Version to 3.0.7